(480÷18-13)×80用简便算法算.
问题描述:
(480÷18-13)×80用简便算法算.
答
题目有错误,应该是450,不是480
(450÷18-13)x80
= [(45x10)÷(9x2)-13]x80
= [(45÷9)x(10÷2)-13]x80
= (5x5-13)x80
= (25-13)x80
= 12x80
= 960