a=40b/b-60 带入到0.6a+0.35b≤22

问题描述:

a=40b/b-60 带入到0.6a+0.35b≤22

因为a=40b/b-60
(1)a=-20
(2)把a=-20 带入到0.6a+0.35b≤22求b
0.6×(-20)+0.35b≤22
0.35b≤22+12
b≤34÷0.35≤3400/35≤680/7
得:a=-20 b≤ 680/7