8.4*7.2+0.84*28简便计算(递等式)
问题描述:
8.4*7.2+0.84*28简便计算(递等式)
答
8.4*7.2+0.84*28
=0.84*72+0.84*28
=0.84*(72+28)
=0.84*100
=84