2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
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2(x+y)-3(x-y)=3 ,4(x+y)+3(x-y)=15
再答: 这题是采用先化简,再带入解答。
再答: 答题不容易,满意请给好评,不满意请追问。
再答: 答题不容易,满意请给好评,不满意请追问。
x+y/2+x-y/3=6,4(x+y)-3(x-y)=-20
{(x+y)/2+(x-y)/3=6 4(x+y)-3(x-y)=-20
4(x+y)-3(x-y)=-20,2/x+y+3/x-y=6
{3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1
3(x+y)-4(x-y)=11,2(x-y)+5(x+y)=27
(x+y)(x+2y)(x+3y)(x+4y)=-40
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