小學(xué)四年級暑假奧數(shù)培訓(xùn)第10講：簡便計(jì)算專題訓(xùn)練

1、簡便計(jì)算專題訓(xùn)練1得分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+2863065 -738-1065899+3442357-183-317-3572365-1086-214497 - 2992370+19953999+498138X25X4(13 XI25) 3 >8)簡便計(jì)算練習(xí)題70

2、4X2525X32X12588X125102 X76178 X101 -17884X36+64X8483 X102 -83X298 X19950 Z34 M)刈25X (24+16)(12+24+80) >502得32X(25+125)58X9875 X99+2 X75123X18-123X3+85X123178 X99+17816800+12035700210032000+40021500+125第五種125X32X825X32X12588X12572X125497007001248243150154800 95簡便計(jì)算練習(xí)題3得分2356- (1356-721)1235 (1780-

3、1665)75X27+19X2 5簡便計(jì)算練習(xí)題4得分第六種3600 25 W8100+4753000-1258125025531X870+13X3104X(25 >65+25X28)第七種1200-624-762100-728-772273-73-27847-527-273第一種(300+6)x1225x(4+8)125x(35+8)(13+24)x8第八種278+463+22+37732+580+2681034+780+320+166425+14+186第二種84x101504x2578x10225x204第三種99x6499x16638x99999x99第九種214- (86+14

4、 )787- (87-29)365- (65+118)第十種576-285+85825-657+57690-177+77455- (155+230)755-287+87第四種99X13+13第十一種25+199X2532X16+14X3278X4+78X3+78X3871-299157-99363-199968-59913+24X8672-36+64324-68+32100-36+64第十二種178X101-17883X102-83X217X23-23X735X127-35X16-11X35簡便計(jì)算練習(xí)題6得分簡便計(jì)算練習(xí)題5得分容易出錯(cuò)類型（共五種類型）660-60 1520X4 20X47

5、36-35X2025X4+25X426X 39+61X26356X9 56X 999X 55 + 5578X 101-7852X 76 + 47X 76+76 134X 56134+ 45X 13498-18X5+2556X8 56X8 + 280-80 -412X6 12X6 +175-75 2525X8 25X880-20X2+6036X936XK48X 52X2 4X4825X 23X (40+ 4)999X 999+199936-36 6-625X8(25X8)100+45-100+4515X97+3184+ 98695+202864-199738-301100+1-100+148X9

6、9+11000+8-1000+85+95X28102+1-102+165+35X1325+75-25+7540+360-20-10380+ 476+120(569 + 468)+ (432+131)704 X 25256-147- 53373-129 + 29189(89+74)28X4X25125X32X259X72X125簡便計(jì)算練習(xí)題7得分720+16+5630+42456(256- 36)102X3598X42158+262+138375+219+381+2255001-247-1021-232(181+2564) +2719378+44+114+242+222276+228+353+

7、219(375+1034)+(966 + 125)(2130+783+270)+101799+999+9999+99999 7755 -(2187+755) 2214+638+2863065- 738-1065899+3442357-183-317-3572365-1086-214497-2992370+1995簡便計(jì)算練習(xí)題8得分3999+4981883-39812X2575X24138X25X4(13X 125)X(3 X8)(12+24+80) X5025X32X 12532X(25+125)88X125102X76178X 101-17884X36+64X 8475X99+2X7598

8、X 199123X 18-123X 3+85X 12350X (34X4) x 399+999+9999+999997755-(2187+755)25X (24+16)178X 99+17879X 42+79+79X 572214+638+2863065-738-1065899+3442357- 183-317-3572365 -1086-214 497 -2997300+ 25+48100+ 4 + 75158+262+138簡便計(jì)算練習(xí)題9得分1248+ 243150+ 154800+ 2521500+ 1252370+19953999+4981883-398375+219+381+225

9、 5001 -247-1021-232(181+2564) +2719378+44+114+242+222276+228+353+219簡便計(jì)算練習(xí)題10得分12X2575 X 24138X 25X 4(13X 125)X(3 X8)(12+24+80) X 50704X 2525X 32X 12532X(25+125)(375+1034)+(966+125)(2130+783+270)+101788X125102X7658X98178X101 17814.9 (5.2+4.9)18.325.47 4.3283X 102 83X284X 36+64X 8475X 99+2X 7598 X 19

10、9123X 18 123 x 3+85X 12350X (34X4) X 325 X 6.8 X 0.040.25 X 32 X 0.1256.4 X 1.25 X 12.523 X 0.1 + 2.3 X 9.90.18+4.26 -0.18 +4.2625X (24+16)178X99+17879X42+79+79X5721500+ 1257300+ 25+48100+ 4 + 7516800+ 120簡便計(jì)算練習(xí)題11得分(a+ b) + c = a + ( b + c)2.73 + 0.89 + 1.27 4.37+ 0.28 + 1.63 + 5.72c x (a+b) = c x

11、a + cx b0.45 X 2010 .58 X 10.150.2 乂 994.7 乂 9.9簡便計(jì)算練習(xí)題12得分3.28 X 5.7 + 6.72 X 5.72.1 X 99 + 2.1a bc = a (b+c)0.58 X 1.3 + 0.58 X 1.37.3 +4 + 2.7 X 0.2510 0.432 2.5689.35.26 2.743.75 X 0.5 2 .75 + 25.26 X 0.12 5 + 2.74 + 8a + b + c = a +(bx c)6.3 + 1.89.5 + (1.9 X 8)12.8 + (0.4 乂 1.6)930 + 0.6 +563.

12、4 + 2.5 + 0.4(7.7 + 1.54 ) + 0.7簡便計(jì)算練習(xí)題13得分6.9 +4.8 +3.115.89+ (6.75 5.89)7.85 +2.34 0.85 +4.6635.6-1.8-15.6-7.213.75 (3.75 +6.48)47.8-7.45+2.5566.86 -8.66 -1.340.25 X16.2 X40. 25X 32 X 0.1252 .5 X(4 +0.4)(1.250.125)X84.8 X100.14.2 X 9956.5 X 9.9 +5.657.09 X10.8 0.8 X 7.093.83 X 4. 56+ 3.83 乂 5.443.

13、65 乂 4.7 36.5 乂 0.375.4X11-5.413.7X0.253.7+4 10.7X16.1-1.1X10.7+10.7 X5運(yùn)算定律和性質(zhì)1、加法交換律：兩個(gè)加數(shù)交換位置，和不變。這叫做加 法交換律。用字母表示：a+b=b+a2、加法結(jié)合律：三個(gè)數(shù)相加，先把前兩個(gè)數(shù)相加，或者 先把后兩個(gè)數(shù)相加，和不變。這叫做加法結(jié)合律。用字母表示：(a+b) +c= a +( b+c)3、乘法交換律：兩個(gè)因數(shù)交換位置，積不變。這叫做乘法交換律。用字母表示：axb=b Xa4、乘法結(jié)合律：三個(gè)數(shù)相乘，先把前兩個(gè)數(shù)相乘，或者先把后兩個(gè)數(shù)相乘，積不變。這叫做乘法結(jié)合律。用字母表示：(axb) Xc= a x(bxc)5、乘法分配律：兩個(gè)數(shù)的和與一個(gè)數(shù)相乘，可以先把它 們與這個(gè)數(shù)分別相乘，再相加。這叫做乘法分配律。用字母表示：(a+b) Xc= axc+bxca x( b+c) =aXb+aXc拓展： (a-b) Xc= aXc-bXca x( b-c) =aXb-aXc6、減法的性質(zhì)：一個(gè)數(shù)連續(xù)減去兩個(gè)數(shù)，可以減去這兩個(gè)減