x=3a y=4a z=7a 于是有 6a-4a+7a=-18 a=-2 x=-6 y=-8 z=-14 x+y+z=-28 如果我的回答有帮到你 请给 好评 谢谢
已知x:y:z=3:4:7,且2x-y+z=-18,求x+y+z.
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