如题所述
3.6拆分成9×0.4,先计算取整的计算,0.4×2.5=1,简便计算3.6×2.5=9×0.4×2.5=9×(0.4×2.5)=9×1=9验算见截图
3.6×2.5
=4×0.9×2.5
=0.9×4×2.5
=0.9×10
=9
3.6X2.5
=0.9ⅹ(4x2.5)
=0.9X10
=9