0.7*(1+40%)X+0.9*(1+40%)y=399 ,(1+40%)x+(1+40%)y=490急
来源:学生作业帮助网 编辑:作业帮 时间:2024/07/18 10:27:23
![0.7*(1+40%)X+0.9*(1+40%)y=399 ,(1+40%)x+(1+40%)y=490急](/uploads/image/z/14104472-32-2.jpg?t=0.7%2A%EF%BC%881%2B40%25%EF%BC%89X%2B0.9%2A%EF%BC%881%2B40%25%EF%BC%89y%3D399+%2C%EF%BC%881%2B40%25%EF%BC%89x%2B%EF%BC%881%2B40%25%EF%BC%89y%3D490%E6%80%A5)
x)33zP@m=KdJ[cKK$
miKg
Kmb v6uFvXN$ 56ةd<pa[#S
[CS F 1X #,t
0.7*(1+40%)X+0.9*(1+40%)y=399 ,(1+40%)x+(1+40%)y=490急
0.7*(1+40%)X+0.9*(1+40%)y=399 ,(1+40%)x+(1+40%)y=490
急
0.7*(1+40%)X+0.9*(1+40%)y=399 ,(1+40%)x+(1+40%)y=490急
(x+y)*(1+40%)=490 x+y=350
(0.7x+0.9y)*(1+40%)=399 0.7x+0.9y=285
x=150,y=200