12.5乘以79加12.5乘以2减12.5简算怎么算
问题描述:
12.5乘以79加12.5乘以2减12.5简算怎么算
答
=12.5*(79+2-1)
=1000
答
12.5×79+12.5×2-12.5
=12.5×(79+2-1)
=12.5×80
=100