0.7*(1+40%)X+0.9*(1+40%)y=399 ,(1+40%)x+(1+40%)y=490急
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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=
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