- 2x + 4y x = 3 y = -2?

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2x+y=7 x/3-4y=-3 x,y=? 30. ... X=3,Y=1. 评论(0) 0 0

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4y-[x-3(X+Y)]-3(x+2y)=4y+2x+3y-3x-6y=y-x而x-y=10,所以4y-[x-3(X+Y)]-3(x+2y) ...

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