设一共x台,原来每台成本是y
(2400-y)x=72000
(2400-y7/6)x=72000*0.75
(2400-y)x*0.75=(2400-y7/6)x
(2400-y)*0.75=2400-y7/6
9*2400-9y=2400*12-14y
5y=2400*3
y=1440
x=72000/(2400-1440)=75
望采纳!!!
6)x
(2400-y)*0;6)x=72000*0.75=(2400-y7/.75
(2400-y)x*0考虑税金什么的吗?
设一共x台;6
9*2400-9y=2400*12-14y
5y=2400*3
y=1440
x=72000/,原来每台成本是y
(2400-y)x=72000
(2400-y7/.75=2400-y7/