4.25除以2.5乘以9.9加0.17用简便方法计算
问题描述:
4.25除以2.5乘以9.9加0.17用简便方法计算
答
4.25÷2.5×9.9+0.17
=(4.25×4)÷(2.5×4)×9.9+0.17
=1.7×9.9+0.17
=0.17×(99+1)
=17