(完整版)小學(xué)四年級(jí)簡(jiǎn)便運(yùn)算的練習(xí)題和答案

1、運(yùn)算定律練習(xí)題(1)乘法交換律：axb=bxa38X25X 442X125X 8乘法結(jié)合律：(axb) xc=ax (bxc)25X17X4(25X 125) X ( 8X4)49X4X538X125X8X3(125X25)X4645 X289X2(125X12) X8125X (12X4)(2)乘法交換律和結(jié)合律的變化練習(xí)125X64125X 8844X25125X2425X28(3)加法交換律：a+b=b+a加法結(jié)合律：(a + b) +c=a+ (b+c)357+ 288+143158+395+105167+ 289+ 33129+235+ 171 + 165378+ 527+73169

2、+78 + 2258+39+42+61138+293+62+107(4)乘法分配律：(a+b) xc=ax c+bx c正用練習(xí)(80+4) X25(20+4) X 25(125+17) X825X (40+4)15X (20+3)(5)乘法分配律正用的變化練習(xí)：36 M25 39 M01125 >88201X24(6)乘法分配律反用的練習(xí)：34X72+34X2835X 37 + 65X 3785X 82+85X 1825X 97+25X376X 25 + 25X 247)乘法分配律反用的變化練習(xí)：38X 29+ 3875X299+7564 X 199+ 6435X68 + 68+68X

3、64思考題：( 8)其他的一些簡(jiǎn)便運(yùn)算。800+ 256000+ 1253600+8 + 558X 1015874X99【思路導(dǎo)航】在除法里，被除數(shù)和除數(shù)同時(shí)乘或除以一個(gè)相同的數(shù)，商不變。325 笠5=(325M) + (25 >4)=1300T00=13【練一練 1】(1) 450攵5(2) 525攵5(3) 3500+125(4) 10000e25(5) 49500得00(6) 9000攵25【經(jīng)典例題二】計(jì)算25X125X4刈【思路導(dǎo)航】如果先把25與 4 相乘，可以得到100，同時(shí)把125與 8 相乘，可以得到 1000；再把 100 和 1000 相乘就可以了。運(yùn)用了乘法交換律

4、和結(jié)合律。25M25M刈=(25M) X (125>8)= 100X1000=100000【練一練 2】(1) 125X15 刈必(2) 25X24(3) 125X16(4) 75X6(5) 125>25>32(6) 25>5X64>125【經(jīng)典例題三】計(jì)算：(1) 125X34+125X66(2) 43X11+43X36+43X52+43【思路導(dǎo)航】利用乘法分配律來(lái)計(jì)算這兩題(1) 125X34+125X66(2) 43X11+43M6+43X52+43=125X (34+66)=43X(11+36+52+1)=125X100=125003】計(jì)算下面各題：(1)

5、 125 >64+125 >36=43X100=4300(2) 64X45+64X71-64 X6(3) 21M3+26X21+21【經(jīng)典例題四】計(jì)算(1) (360+108)36(2) 1攵+3 +2+5攵+7攵【思路導(dǎo)航】?jī)蓚€(gè)數(shù)的和、差除以一個(gè)數(shù)，可以用這個(gè)數(shù)分別去除這兩個(gè)數(shù)，再求出兩個(gè)商 。利用這一性質(zhì)，可以使計(jì)算簡(jiǎn)便。(1) (360+108) 36(2) 12+3 攵+5 攵+7 攵=36036+108-36= (1+3+5+7)笠=10+3=16攵=13=8【練一練 4】(1) (720+96)攵4(2) (4500-90) F5(3) 6342攵1(4) 881139

6、(5) 73 36+105-K36+146-36(6) (10000-1000-100-10)勺0【經(jīng)典例題五】158 X61H9M【思路導(dǎo)航】在乘除混合運(yùn)算中，如果算式中沒(méi)有括號(hào)，計(jì)算式可以根據(jù)運(yùn)算定律和性質(zhì)調(diào)換乘數(shù)或者除數(shù)的位置，只要計(jì)算：數(shù)字跟著前面的符號(hào)一起移動(dòng)。158 >61 79 >3=15879>61刈=2X61 >3=366【練一練5】計(jì)算下面各題：(1) 238M6T19>5(2) 138X27毋9X50(3) 624X48312-8(4) 406>31204203去括號(hào)的方法，使計(jì)算簡(jiǎn)便?？梢愿爬椋豪ㄌ?hào)前是乘號(hào)，加、去括號(hào)不改號(hào)，括號(hào)前

7、是除號(hào)，田、去括號(hào)要改號(hào)。(1) 103X96勺6=103X (96T6)=103X6【經(jīng)典例題六】計(jì)算下面各題:(2) 200+ (25M)(1) 103>96T6【思路導(dǎo)航】這兩道題都是乘除法混合運(yùn)算，我們可以根據(jù)這兩道題的特點(diǎn)，采用加括號(hào)和可以概括為：括號(hào)前是乘號(hào)，力口、去括號(hào)不改號(hào)，括號(hào)前是除(2) 200+ (254)=200攵5M=8X4=618=326】計(jì)算下面各題：2)1000 + (125%)(1) 612M66T83(3) (13X8X5>6) + (4>5X6)(4) 241 刈45e78345X (678241)【經(jīng)典例題七】計(jì)算：(1) 68X62(

8、2) 85刈5【思路導(dǎo)航】這兩題的形式叫做 “頭同尾合十”它們的計(jì)算方法是：先用兩個(gè)因數(shù)的個(gè)位數(shù)相乘，并把積直接寫(xiě)在末尾，如果積不滿(mǎn)10，十位上要補(bǔ)寫(xiě)0，然后再將兩個(gè)因數(shù)的十位數(shù)乘它本身加 1 的和，積寫(xiě)在兩個(gè)個(gè)位數(shù)積的前面。(1) 68 >62第一步8X2=16,第二步6X (6+1) =42,合起來(lái)是4216(2) 85X85第一步5X5=25,第二步是8X (8+1) =72,合起來(lái)是7225【練一練 7】(1) 23 >27(2) 46 M4(3) 55 X55(4) 91 >99【經(jīng)典例題八】計(jì)算：26X11【思路導(dǎo)航】一個(gè)兩位數(shù)乘11 的方法是：用兩位數(shù)的頭作積的

9、頭，用兩位數(shù)的尾作積的尾，用這個(gè)兩位數(shù)的兩個(gè)數(shù)字之和作積的中間數(shù)(如果相加滿(mǎn)十，則把和的十位數(shù)“1”加到頭上。26X11第一步 2 作積的頭，第二步6 作積的尾，第三步2+6=8 作中間，合起來(lái)是286?！揪氁痪?計(jì)算(1) 53X11(2)39X11(3)65X11(4)98X11【經(jīng)典例題九】計(jì)算：358X11【思路導(dǎo)航】三位數(shù)乘11，用三位數(shù)的頭作積的頭，用三位數(shù)的尾作積的尾，用三位數(shù)前兩位數(shù)字組成的數(shù)加厚兩位數(shù)字組成的數(shù)的和作積的中間數(shù)。358 >11,第一步用3作積的頭，第二步用8作積的尾，在用35+58=93,合起來(lái)是3938。【練一練 9計(jì)算(1) 353X11(2) 65

10、4X11(3) 896X11【練一練1】(1) 450攵5(2) 525攵5(3) 3500+125(4) 10000毋25(5) 49500用00(6) 9000225【練一練2】(1) 125X15刈必(2) 25 >24(3) 125 X16(4) 75X16(5) 125 >25 >32(6) 25X5>64M25(2) 64 >45+64X71-64 X6(3) 21M3+26X21+21【練一練3】計(jì)算下面各題:(1) 125>64+125>36【練一練 4】(1) (720+96)攵4(2) (4500-90) M5(3) 6342攵1(

11、4) 8811395)7336+105-36+146-36(6) (10000-1000-100-10)勺0(2) 138 >27 令9 >50【練一練5】計(jì)算下面各題:(1) 238M6T19>5(3) 624X483123(4) 406X312勺04攵03【練一練6】計(jì)算下面各題:(2) 1000+ ( 1253)(1) 612M66T83(3) (13>8>5>6) + (4>5>6)(4) 241M45令78345X (678笠41)【練一練7】（1） 23 X27(2) 46 M4(3) 55X55(4) 91X99【練一練 8計(jì)算(1

12、) 53X11(2) 39X11(3) 65X11(4) 98X11【練一練 9計(jì)算(1) 353X11(2) 654X11(3) 896M1158+262+138簡(jiǎn)便計(jì)算專(zhuān)題訓(xùn)練375+219+381+2255001 -247-1021 -232(181+2564 ) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+999997755 (2187+755)2214+638+2863065-738- 1065899+3442357-183-317-3572365-

13、1086-214497 2992370+19953999+4981883 -39812X2575X24138 X25 44(13 M25) >(3 >8)(12+24+80) X50704 X25簡(jiǎn)便計(jì)算練習(xí)題225 X32 X12532X(25+125)88X125102X7658X98178X101 -17884X36+64X8475X99+2X7583 X102 83 X298 X199123X18-123X3+85X12350 X(34 >4) >325X (24+16)178X99+17879 >2+79+79X577300 交5 W8100+47516

14、800+12030100210032000+40021500+12549700+7001248+243150+154800 攵5簡(jiǎn)便計(jì)算練習(xí)題32356 (1356721 )1235 ( 1780 1665)75X27+19X2 531X870+13X3104X(25 >65+25X28)(300+6)x1225x(4+8)125x(35+8)(13+24)x884x101504x2578x10225x20499x6499x16638x99999x9999X13+1325+199X2532X16+14X3278X4+78X3+78X3125X32X825X32X12588X12572X1

15、253600 254簡(jiǎn)便計(jì)算練習(xí)題48100 FH53000-12581250+25 W1200-624-762100-728-772273-73-27847-527-273278+463+22+37732+580+2681034+780320+102425+14+186214- (86+14)787- (87-29)365- (65+118)455- (155+230 )576-285+85825-657+57690-177+77755-287+87871-299157-99363-199968-599178X101-17883X102-83X217X23-23X735X127-35X16-

16、11X35容易出錯(cuò)類(lèi)型600-60 15簡(jiǎn)便計(jì)算練習(xí)題（共五種類(lèi)型）20X4 20X4736-35X2025X4+25X498-18X5+2556X856X8280-80 -412X6 12X6175-75 笠525X825X880-20X2+6036X936X936-36 H-625X8(25X8) +100+45-100+4515X97+3100+1-100+148X99+11000+8-1000+85+95X28102+1-102+165+35X1325+75-25+7540+360-20-1013+24X8672-36+64324-68+32100-36+64簡(jiǎn)便計(jì)算練習(xí)題626X 3

17、9+61X26356X9-56X999X 55+5578X101- 7852X76+47X76+ 76134X56 134+45X13448X52X2-4X4825X23X (40+4)999X999+ 1999184+98695+202864-199738 301380 + 476+ 120(569+468) + ( 432+131)704X 25256-147-53373129+29189(89 + 74)28X4X25125X32X259X72X125720+ 16+5簡(jiǎn)便計(jì)算練習(xí)題7630- 42456(256 36)102X35 98 X42158+262+138375+219+38

18、1+2255001 247 1021-232(181+2564) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+999997755-(2187+755)2214+638+2863065-738-1065899+3442357-183-317-3572365- 1086-214497-2992370+1995簡(jiǎn)便計(jì)算練習(xí)題83999+4981883-39812X2575X24138X 25X 4(13X125)X(3X8)(12+24+80) X 5025X 32X

19、 12532X(25+125)88X125102X76178X101- 17884X36+64X 8475X99+2X 7598X199123X18-123X3+85X12350X(34X4) X325X (24+16)178X99+17879X42+79+79X577300+ 25+48100+ 4+75158+262+1381248+24簡(jiǎn)便計(jì)算練習(xí)題93150 154800+ 2521500+ 125375+219+381+225 5001 -247- 1021-232(181+2564) +2719378+44+114+242+222 276+228+353+219 (375+1034

20、)+(966+125)(2130+783+270)+1017 99+999+9999+99999 7755 (2187+755)899+3442214+638+2863065-738- 10652357- 183-317-3572365-1086-214497-2992370+19953999+4981883398簡(jiǎn)便計(jì)算練習(xí)題1012X2575 X 24138X 25X 4(13X 125)X(3 X 8)32X(25+125)(12+24+80) X 50704X 2525X32X12588 125102 7658 98178X101- 17884 36+64 8475 99+2 7583

21、X 102 83X298 19925X (24+16)123X18-123X3+85X12350 X (34 X 4)X3178 99+17879 42+79+79 5721500+ 1257300+ 25+48100+ 4+ 7516800+ 120簡(jiǎn)便計(jì)算練習(xí)題11(a+b) + c = a + (b+c) 2.73 + 0.89 + 1.274.37+ 0.28+ 1.63 + 5.72a b c = a (b+c)10 0.432 2.5689.35.262.7414.9 - (5.2+4.9)18.325.474.32(a x b ) x c = a25 X 6.8 X 0.04(b

22、 x c )0.25 X 32X 0.1256.4 X 1.25 X 12.5c X0.45(a+b) = c x a 義201cx b0.58 X 10.150.2994.7 X9.9簡(jiǎn)便計(jì)算練習(xí)題3.28X 5.7 + 6.72X 5.72.112X 99 + 2.123義0.1 + 2.3 X 9.90.18+ 4.26 -0.18 +4.260.58X1.3 + 0.58 X1.37.3 +4 + 2.7 X 0.253.75 X 0.52.75 + 25.26 X 0.125 + 2.74 + 8a + b+ c = a + (bx c )6.3 + 1.89.5 + (1.9 X

23、8)12.8 + (0.4 乂 1.6 )930 + 0.6 +563.4 + 2.5 + 0.4(7.7 + 1.54 ) + 0.7簡(jiǎn)便計(jì)算練習(xí)題136.9 +4.8 +3.115.89+(6.75 5.89) 7.85+2.34 0.85 +4.6635.6 1.8 15.6 7.2 13.75 (3.75 + 6.48) 47.8 7.45+2.5566.86 -8.66 -1.340.25 X16.2 X40.25 X 32 X 0.1252 .5 X(4 +0.4)(1.250.125)X84.8 X 100.14.2 義 9956.5 義 9.9 + 56.57.09 X 10.

24、8 0.8 義 7.093.83 X 4.56+3.83 X 5.443.65 X 4.736.5 X 0.375.4 X 11-5.413.7 X0.25-3.7-410.7 X 16.1 -1.1 X10.7 +10.7 X5簡(jiǎn)便計(jì)算專(zhuān)題訓(xùn)練158+262+138375+219+381+2255001 -247-1021 -232(181+2564 ) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+999997755 -(2187+755)2214+638+2

25、863065-738- 1065899+3442357-183 -317 -3572365-1086-214497 2992370+19953999+4981883 -39812X2575X24138 X25 X4(13 M25) X3 >8)(12+24+80) X5032 X(25+125)簡(jiǎn)便計(jì)算練習(xí)題2704 X2525 X32 X12588X125102X7658X98178X101 -17884X36+64X8475X99+2X7583 X102 83 X298 X199123X18 123X3+85X12350 X(34 M) )325X (24+16)178X99+178

26、79 >2+79+79X577300-25 W8100FH516800+12030100210032000+40021500+12549700+7001248+243150+154800 交52356 - (1356簡(jiǎn)便計(jì)算練習(xí)題3 721 )1235-(1780- 1665)75X27+19X2 531X870+13X3104X(25 >65+25X28)278+463+22+37732+580+2681034+780320+102425+14+186(300+6)x1225x(4+8)125x(35+8)(13+24)x884x101504x2578x10225x20499x6

27、499x16638x99999x9999X13+1325+199X2532X16+14X3278X4+78X3+78X3125X32X825X32X12588X12572X1253600 254簡(jiǎn)便計(jì)算練習(xí)題48100 FH53000-12581250+25 W1200-624-762100-728-772273-73-27847-527-273214- (86+14)787- (87-29)365- (65+118)455- (155+230 )576-285+85825-657+57690-177+77755-287+87871-299157-99363-199968-599178X101

28、-17883X102-83X217X23-23X735X127-35X16-11X35簡(jiǎn)便計(jì)算練習(xí)題5容易出錯(cuò)類(lèi)型（共五種類(lèi)型）20X4 一736-35X2025X4+25X4600-60 1520X498-18X5+2556X856X8+280-80 -412X6 12X6175-75 2525X825X8 +80-20X2+6036X936X936-36 6-625X8(25X8 ) +100+45-100+4515X97+3100+1-100+148X99+11000+8-1000+85+95X28102+1-102+165+35X1325+75-25+7540+360-20-1013+

29、24X8672-36+64324-68+32100-36+64簡(jiǎn)便計(jì)算練習(xí)題626X 39+ 61 X 26356X 9-56X 999X55+ 5578X101- 7852X76+47X76+ 76134X56 134 + 45X 13448X52X2-4X4825X23X (40 + 4)999X 999+ 1999184+98695+202864-199738-301380 + 476+120(569+468) + ( 432+ 131)704X 25256-147-53373129+29189 (89+74)28X4X25125X 32X259X72X125720+ 16+5簡(jiǎn)便計(jì)算練

30、習(xí)題7630+ 42456(25636)102X 35 98 X42158+262+138375+219+381+2255001 -247-1021-232(181+2564) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+999997755 (2187+755)2214+638+2863065-738-1065899+3442357-183-317-3572365- 1086-214497-2992370+1995簡(jiǎn)便計(jì)算練習(xí)題83999+4981883-398

31、12X2575 X 24138X 25X 4(13X125)X(3X8)(12+24+80) X 50102X 7625X 32X 12532X(25+125)88X125178X101- 17884X36+64X 8475X99+2X 7598X199123X18-123X3+85X12350 X (34X4) X 379X42+79+79X 5725X (24+16)178X 99+1787300+ 25+48100+ 4+ 75158+262+1381248+ 24簡(jiǎn)便計(jì)算練習(xí)題93150 154800+ 2521500+ 125375+219+381+2255001-247-1021-

32、232(181+2564) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+999997755-(2187+755)2214+638+2863065-738- 1065899+3442357- 183-317-3572365- 1086-214497-2992370+19953999+4981883-39812X25簡(jiǎn)便計(jì)算練習(xí)題1075X24138X 25X4(13X125)X(3X8)(12+24+80) X50704X 2525X32X12532X(25+12

33、5)88 125102X7658X98178X101- 17898 19984X36+64X 8475X99+2X7583X102 83X2123X18-123X3+85X12350X(34X4) X 325X ( 24+16)178 99+17879 42+79+79 5721500+ 12516800+ 120+ 0.28 + 1.63 + 5.727300+ 25+48100+ 4+ 75簡(jiǎn)便計(jì)算練習(xí)題11(a+b) + c = a + ( b+c)2.73 + 0.89 + 1.274.37 a b c = a (b+c)10 0.432 2.5689.3 5.26 2.7414.9

34、(5.2 +4.9 )18.32 5.47 4.32(ax b)xc = a x(bx c )25 X 6.8 X 0.040.25 X 32 X 0.1256.4 X 1.25 X 12.5c X0.45(a+b) = c x a + cx bx 2010.58 x 1 0.150.2x 994.7 X 9.93.28簡(jiǎn)便計(jì)算練習(xí)題12X 5.7 + 6.72 X 5.72.1 X 99+ 2.123義0.1 + 2.3 X 9.90.18+ 4.26-0.18 +4.260.58X1.3 + 0.58 X1.37.3+ 4 + 2.7X 0.253.75X 0.52.75 + 25.260

35、.125 +2.74a +6.3b + c = a+ 1.8(b x c)9.5 -(1.9 義 8)12.8(0.4x 1.6 )930 + 0.6 +563.42.5 + 0.4(7.7+ 1.54)+ 0.76.9 +4.8 +3.115.8935.6 1.8 -15.6 -7.266.86 -8.66 -1.34簡(jiǎn)便計(jì)算練習(xí)題13十 (6.75 5.89)7.8513.75 (3.75 +6.48)0.25X16.2X4+ 2.3447.8-0.85 + 4.66-7.45+2.550.25 X32 X 0.1252 .5 X(4 +0.4)(1.250.125)X84.8 X 100

36、.14.2 X9956.5 X9.9+ 56.57.09 X10.8-0.8 X7 .093.83 X 4.56+3.83 X 5.443.65 X 4.736.5 X 0.375.4 X 11-5.413.7 X0.25-3.7-410.7 X16.1 -1.1 X10.7 +10.7第一類(lèi)：加65+73+135357+288+143272+68+28129+235+171+16517+145+23+35999+99+9+36+7+8+102+103+1049998+3+99+998+3+9第二類(lèi)：減400-256-44517-53-47284-159-41258-42-16545-167-

37、145478-47-178344- (144+37)236- (177+36)第三類(lèi)：乘45 4 523 5 225 9 48X (125X3)(250M25) X (4X8)88X12572X25125 >64 >2542 125 8 5第四類(lèi)：乘(12+50) >4025 4 88 125125 義(40-4)76X10318 12525X4442X2599 >999 >78第五類(lèi)：乘45 37+37 5528 21+28 7917 23-23 738 46+64 3899 32+3246+46 59167 2+167 3+167 539 8+6 39-39

38、428 225-2 225-6 225(42+25) M25+ (18+15) X12599 22+33 3423 2 4+25 4 2+27 1 8+25 8 1第六類(lèi)：除360%得250芍攵600T2 芍800 七 3480 H5 F8240芍 T2420352400257800 T25第七類(lèi)：加減92+99197+102354-108127-98323+189-123248-86+48672-36+64(6467-832) + (1832-1467)1530+ (592-530) -192(2+4+6+98+100) - (1+3+5+97+99)第八類(lèi)：乘除960 >46 M89

39、9000 T21 X13702 M8 T234640 + ( 16M)1000+ (125M)第九類(lèi)：加減乘除(98+147) F9(230-23)笠3(250-25)笠51736 28+1064 28125 X (860+240 T2)700+612 T2 M(37+15) >85+13602005 >20062006-2006 20052005158+262+138375+219+381+2255001 - 247- 1021- 232(181+2564) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(21

40、30+783+270)+101799+999+9999+999997755- (2187+755)2214+638+2863065-738- 1065899+3442357-183-317- 3572365-1086-214497-2992370+19953999+4981883- 39812>2575 >24138 >25X4(13 X25)召渴)(12+24+80)簡(jiǎn)便計(jì)算練習(xí)題704 >2525 刈 2 XI2532X25+125)88X125102X7658洸178X101-17884>36+64>8475 >99+2 M583X102-83

41、>298 X199123X18-123 >3+85X12350 X34 4) 325X(24+16)178>99+17879 >42+79+79>57730025 M8100M "516800 T2030100 21003150 154800 2575>27+19X2 532000 40021500 12549700 7001248 24簡(jiǎn)便計(jì)算練習(xí)題32356- ( 1356721)1235- (1780-1665)31 >870+13 >3104X25 )65+25 >28)(300+6)x1225x(4+8)125x(35+

42、8)(13+24)x884x101504x2578x10225x20499x6499x16638x9978X4+78X3+78X3125X32X8簡(jiǎn)便計(jì)算練習(xí)題4360025 M8100 M "532X16+14X32999x9999X13+1325+199X2525X32X12588X12572X1253000 T25 31250 笠5 芍1200-624-762100-728-772273-73-27847-527-273278+463+22+37732+580+2681034+780320+102425+14+186214-（ 86+14）787-（ 87-29）365-（ 6

43、5+118）455-（ 155+230）576-285+85825-657+57690-177+77755-287+87871-299157-99363-199968-599簡(jiǎn)便計(jì)算練習(xí)題5600-60 1520X4 攵0X4736-35X2025X4+25X498-18X5+2556X8 y6X8280-80 -412X6 +12X6175-75 2525X8+25X880-20X2+6036X9+36X936-36 6-625X8+ （25X8）100+45-100+4515X97+3100+1-100+148X99+11000+8-1000+85+95X28102+1-102+165+3

44、5X1325+75-25+7540+36020-1013+24X8672-36+64324-68+32100-36+6499X55+5578X101-78簡(jiǎn)便計(jì)算練習(xí)題626 M9+ 61 >26356 >9-56 >952X76+ 47 >76+76134 >56-134+45X13448 >52X24X4825X23X (40+ 4)999 >999+ 1999184+ 98695+ 202864-199738-301380+476+120(569+ 468) + ( 432+ 131)704 >25256-147-53373 129+291

45、89 (89+74)28X4 >25125 >32 >259M2X25簡(jiǎn)便計(jì)算練習(xí)題7720T6芍630 M2456 (256 36)102 M5 98 42158+262+138375+219+381+2255001 247 1021 232(181+2564) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+101799+999+9999+999997755- (2187+755)2214+638+2863065- 7381065899+3442357 183 317 3572365 1086 214497 2992370+1995簡(jiǎn)便計(jì)算練習(xí)題3999+49