50.4乘2.5-38的简便算zenmexie
来源:学生作业帮助网 编辑:作业帮 时间:2024/11/18 18:57:24
再问:然后再答:
0.4×1.25×8×2.5=(0.4×2.5)×(1.25×8)=1×10=10
114*11=114*(10+1)=1140+114=1254
3.8*4.2+3.8*10*0.58=3.8*4.2+3.8*5.8=3.8*(4.2+5.8)
2.5乘0.4等于1,3.8乘0.2等于0.76,结果就是0.76
原式=(10-0.2)×2.5=10×2.5-0.2×2.5=25-0.5=24.5
8.7(0.25+7.5)=8.7*7.75=67.425
3.6x10.2=3.6x(10+0.2)=36+0.72=36.72(4-0.4)x2.5=10-1=94.8-4.8x0.5=4.8-(4+0.8)x0.5=4.8-2-0.4=2.4
0.85乘0.4乘2.5=0.85*(0.4*2.5)=0.85*1=0.85102乘5.2=(100+2)*5.2=100*5.2+2*5.2=520+10.4=530.4
=12(1+19)=240
0.94乘2.5加0.094乘75=0.94x2.5+0.94x7.5=0.94x(2.5+7.5)=0.94x10=9.4
1.25*4*0.8*2.5
1.25*8.08=1.25*(8+0.08)=1.25*8+1.25*0.08=10+0.1=10.1
(2.5+0.125)×0.8=2.5×0.8+0.125×0.8=2+0.1=2.1
根据乘法交换律,把0.32拆开来,就有(2.5*0.4)*(0.8*1.25)=1*1=1
25×125×6=25×125×2×3=25×250×3=6250×3=18750
2.5*0.875+0.25*1.25=2.5*0.875+2.5*1.25/10=2.5*(0.875+1.25/10)=2.5*(0.875+0.125)=2.5请参考.
1.25x3.2x2.5=1.25x8x0.4x2.5=10x1=10
12.5x3.2x2.5=12.5x8x0.4x2.5=(12.5x8)x(0.4x2.5)=100x1=100再问:2.5乘0.32乘1.25的简便计算是什么?