脱式计算怎么简便怎么算 28乘11111 99999乘8
来源:学生作业帮助网 编辑:作业帮 时间:2024/04/19 17:32:29
0.125*8*0.25*4,答案为1
1.25×3.75×0.8=1.25×0.8×3.75=1×3.75=3.75
0.35X(100-1)=0.35X100-0.35X1=35-0.3534.65
(25乘13)乘(8乘27)=(25乘8)乘(13乘9)乘3=200乘117乘3=100乘(2乘117乘3)=100乘702=70200
6.3x99=6.3x(100-1)=6.3x100-1x6.3=630-6.3=623.75.6*101=5.6(100+1)=560+5.6=565.6
0.72乘102=0.72×(100+2)=72+1.44=73.44再问:真的吗?好像是0.72乘102=0.72×(100+2)=0.72+1.44=2.16再答:0.72×100=0.72???
=40×25+4×25=1000+100=1100
=1+0.99+0.99×99=1+0.99×(1+99)=1+0.99×100=1+99=100
81x99=81x(100-1)=81x100-81=8100-81=8019
87分之86×86=87分之86×(87-1)=87分之86×87-87分之86×1=86-87分之86=85又87分之1
4/27x28=4/27x(27+1)=4+4/27=4又4/27再问:那27乘28分之27呢?再答:27x27/28=(28-1)x27/28=28x27/28-1x27/28=27-27/28=2
51.6/(3.4-1.25x0.8)=51.6/[3.4-1.25x(4/5)]=51.6/[3.4-0.25x4]=51.6/[3.4-1]=51.6/2.4=516/24=(480+36)/24
99×43+43=99×43+43×1=(99+1)×43=100×43=4300
3.6x0.25=0.9x4x0.25=0.9x(4x0.25)=0.9x1=0.9
16*5+34*5+28=5*(16+34)+28=5*50+28=278
40×99+1=40×(100-1)+1=4000-40+1=4000-39=3961
25×37×4125×7×8=25×36×125×33×7×8+25×125×33×8×7=900×1000×33×7+1000×25×32×7+1000×25×7=29700000×7+560000
27乘28分之3=(28-1)×3/28=28×3/28-1×3/28=3-3/28=2+1-3/28=2+25/28=2又25/28希望对您有所帮助再问: 谢谢啦!!!