180减80乘5分之4怎么简便运算啊?
问题描述:
180减80乘5分之4怎么简便运算啊?
答
180-(80\5*4)
答
180-80x4/5
=100+80-80x4/5
=100+80x(1-4/5)
=100+80x1/5
=100+16
=116