x*(1-1/5)=80 还有一题:x+1/4x =60 *=乘
问题描述:
x*(1-1/5)=80 还有一题:x+1/4x =60 *=乘
答
x*(1-1/5)=80
x*4/5=80
x=80÷4/5
x=100
x+1/4x =60
5/4x=60
x=60÷5/4
x=48