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已知(-x+6):(x-y):(4x+y)=3:14:1,求x+y的值
已知(-x+6):(x-y):(4x+y)=3:14:1,求x+y的值
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2020-06-16 02:08
已知(-x+6):(x-y):(4x+y)=3:14:1,求x+y的值
已知(-x+6):(x-y):(4x+y)=3:14:1,求x+y的值
(-x+6):(4x+y)=3:1,可得13x+3y=6
(x-y):(4x+y)=14:1,可得11x+3y=0
所以,上面新得两式相减则得,2x=6,x=3,则y=-11
x+y=-8