1.6x1.25简算方法如下:
1.6x1.25
=1.6x(1+0.25)
=1.6x1+1.6x0.25
=1.6+0.4
=2
因为1.25×8=10
1.6=8×0.2
所以1.6×1.25
=0.2×8×1.25=0.2×10=2
可以使用乘法结合律简便计算。
解:1.6✘1.25
=0.2X8X1.25
=0.2X10
=2
原式=(4x0.4)x1.25
=4x1.25+0.4x1.25
=4x1+4x0.25+0.4x1+0.4x0.25
=4+1+0.4+0.1
=5+0.5
=5.5
1.6×1.25
=(0.8×2)×1.25
=1.25×0.8×2
=1×2
=2