0.42乘7.5加5.8乘0.75简便计算
问题描述:
0.42乘7.5加5.8乘0.75简便计算
答
0.75X0.42x10+5.8x0.75
=0.75x4.2+5.8x0.75
=0.75x(4.2+5.8)
=0.75x10
=7.5