四年級(jí)下冊(cè)簡(jiǎn)便運(yùn)算集錦1整理版

1、四年級(jí)下冊(cè)第三單元簡(jiǎn)便運(yùn)算舉例、練習(xí)125x(8+8)(11+25)x8第一種(例)25x(4+8)=25x4+15x8=100+120=220第二種(例)84x101=84x(100+1)=84xlOO+84xl=8400+84=8484504x2578x10225x204第三種(例)99x64=(100-1)x64=100 x64-lx64=6400-64二633699x16638x99999x99第四種(例)99X13+13=(99+1)X13=100X13=130025+199X2532X16+14X3278X4+78X3+78X3第五種(例)25X32X125125X32X888X1

2、2572X125=(25X4)X(8X125)=100X1000=1000001250+25+5第六種(例)3600:25948100753000+125+8=3600-?(25X4)=36004-100二36847-527-273732+580+268425+14+186第七種2273-73-27=1200-(624+76)=1200-700=500第八種278+463+22+37=(278+22)+(463+37)=300+500=800第九種214-(86+14)787-(87-29)365-(65+118)455-(155+230)=214-14-86=200-86=114第十種871

3、-299=871-300+1157-99363-199968-599=571+1=572第十一種178X101-17883X102-83X217X23-23X735X127-35X16-11X35=(101-1)X178=100X178=17800第十二種64+(8X2)=64+8+21300*13X5)480+(8X2)=84-2=4第十三種62525=625+5+536024270:45=125+5=25第十四種100+45-100+45=(100-100)+(45+45)25+75-25+75423+76-76+77243+85-243+85=0+90=90第十五種20X44-20X4=

4、(204-20)X(4X4)25X4+25X456X8+56X812X6:12X6=1X16=16練習(xí)：169+354+231+146987-362-1381347-(347+125)135+236-135+236198X26148X56-48X562104-15199X37+37215X63-15X63101X22-22203X14125X33X4125X16X50365+997452-398簡(jiǎn)便運(yùn)算習(xí)題L加法交換律(a+b=b+a)如：152+389+348=152+348+399=500+399=899習(xí)題：77+56+23165+477+135154+288+462.加法結(jié)合律a+b+

5、c=a+(b+c)如：591+482+118=591+(482+118)=591+600=1191習(xí)題：285+147+25399+178+122456+588+412692+325+753,加法交換律、結(jié)合律如：32+29+68+41=32+68+29+41加法交換律=(32+68)+(29+41)加法結(jié)合律=100+70=170習(xí)題：(148+64)+(52+136)650+(171+350)+129128+114+86+1724.乘法交換律aXb=bXa如：25X45X4=25X4X45=100X45=450025X31X4125X27X840X69X255.乘法結(jié)合律：aXbXc=aX

6、(bXc)如：78X125X8125X3227X99+27=27X(99+1)=27X10027X99=27X(100-1)=27X100-27X1=2700=2700=2673習(xí)題：67X34+67X66127X43-27X4327X101-2727X10167X21+67X78+6767X23+67X78+67-6712X340+66X12025X44125X8885X10269X10278X98=78X(125X8)=78X1000=78000習(xí)題：52X25X4=125X(8X4)=125X8X4=4000125X72125X8825X3225X44125X48.乘法交換律、結(jié)合律如：

7、125X4X8X25=125X8X4X25乘法交換律=(125X8)X(4X25)乘法結(jié)合律=1000X100=100000習(xí)題：125X25X32.乘法分配律:aX(b+c)=aXb+aXc如：27X57+27X43=27X(57+43)=27X10065+65X995X87+87+87X48,減法運(yùn)算性質(zhì);如：781-178-122a-b-c=a-(b+c)=a-c-b721-488-121745-(245+188)=781-(178+122)=721-121-488=745-245-188=781-300=600-488=500-188=481習(xí)題：456-273-127=112=312

8、623-169-223553-(289+153772-456+228689-(289-153136-88+164-1129.除法運(yùn)算性質(zhì);a-?b-rc=av(bXc)=a如：720-t36v2=7204-(36X2)=720v72=10習(xí)題：27004-254-456004-254-563900+(39X4)綜合練習(xí)簡(jiǎn)便運(yùn)算怎樣簡(jiǎn)便就怎樣算。一、355+260+140+24598x10148x125645-180-24538x99+383500vl4-?5175x56+25x5650 x25x20 x40二、368+156+344+132125x47x8720025%44x2596x58+9

9、6x4263004-(63x5)482-(182+50)135x27+135x72+135三、368+156+344+132125x47x87200v25v444x2596x58+96x4263004-(63x5)482-(182+50)135x27+135x72+135四、789-136-64132x29+13298x83+1663700v4v2588x125048x125125x32x12536x88+36x15-108五、355+260+140+24598x10148x125645-180-245!38x99+383500:14+5175x56+25x56125x32x25六、98+26

10、5+202A273-73-27250 x13x43200+4+2588x12599x38+3817x23-23x772x125七、64x15-5x6425x(12x40)99x56+562182-1655-345320044-25298x99+298(40+8)x2597x8x125八、355+260+140+245102X992X125645-180-245382X101-3824X60X50X835X8+35X6-4X35125X32九、25X46987-(287+135)十、487-287-139I89X99+89十一、698-291-9(236+189+64101X5699X26102

11、2-478-422478-256-144672-36+6461500-257-34-1432000-368-36+64-36+641814-378-422155+264+36+4425X(20+4)568-(68+178)56119+58759-126-25925x79x488X225+225X12382+165+3582569-256-44十二、216+89+1157x125x81050915+7169x12323x16937x99+37129x101-129149x69-149+149x3256x51+56x48+56十三、125x25x3224x25125x48514+189-21436

12、9-256+15656x25x4x12524x73+26x24109+(291-176)十四、16x98+32512+(373-212)228+(72+189)169+199586x9957525027537x2121x1221125x88x25三、計(jì)算(能簡(jiǎn)便就簡(jiǎn)便)一、85+14x(14+208926)21+(327-23)+19539-513X378+14)34-3094X7+1319+(253-22)4-2150+20 x28-42(23+23)x24-597(110-10M0-1045-24+14x14二、304-275+(275+25)(70+10)4-(18-10)1204-12

13、x18-5444+16x15-32(10-1004-10)x11(53-588:21)x36(60+10)+(17-10)17+(233-43)10lOOvlOxlO-60三、424-475919x16(22+(374-10)4-26(245-11)18-1122-(10+1004-10)(252-14)+17-1035-13+10 x15.(346-10)4-16-12215-1984-(12111)(45-651*1)x33四、19+1924-12-1057222x23-15819+56-12244-34(714-12)+27-1914+(21-19)x1418-(13+15)4-2627

14、36+(43-20)x23(227+11H31-14)36+19x14-23五、828923x12-4818-15+10 x18(31-1544-11)x12(1369-37)+37-32985-728+26x35(六、50+1604-4078x50-1440-M2(326+95x25)-37七、178-1455x6+42160(22-12)x22357+21x13-21350+160:40=54(438-39)+21-12(20+18)x11-239(58+370)v(64-45)120-14418+35385616+85x1640004-(16+8324-13)(723618-228)x2

15、8(4275-24x75)4-25420+580-64x214-28120-14418+35=147812-700：(9+31x11)(58+37).(64-9x5)954-(64-45)178-1454-5x6+42120-36x418+35八、58X58+58X423874-(874+1000)136X101-136329-38-62347-129-14746004-254-460004-1254-825X125X323604-45九、44X25591+482+11899X126125X15X8986+1999473+79-6380X501-8076+38+24+162199X99+199

16、十、25X125X4X832+129+268+7140X9X25X8438+126+162+67455X25+25X4555X55+45X559X59+9X318X13X12599X99+998X6X125X5十一、45X12+55X1218X27+18X237X69+7X21十二、250X36125X3245X201-45十三、8X6X1258X135+8X6556X37-56X26-5642X9+58X955X45+45X4558X137-58X3778X8-28X836X27+27X6499X64+6448X250202X45199X50301X3049X49+4925X(8+40)7X4X250250X3X499X199+9935X401-3539X101-3938