已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.详细一点快点!O(∩_∩)O谢谢
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![已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.详细一点快点!O(∩_∩)O谢谢](/uploads/image/z/568182-30-2.jpg?t=%E5%B7%B2%E7%9F%A5xy%2Fx%2By+%3D3%2C%E6%B1%822x-3xy%2B2y%2F-x%2B3xy-y+%E7%9A%84%E5%80%BC.%E8%AF%A6%E7%BB%86%E4%B8%80%E7%82%B9%E5%BF%AB%E7%82%B9%21O%28%E2%88%A9_%E2%88%A9%29O%E8%B0%A2%E8%B0%A2)
已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.详细一点快点!O(∩_∩)O谢谢
已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.
详细一点
快点!
O(∩_∩)O谢谢
已知xy/x+y =3,求2x-3xy+2y/-x+3xy-y 的值.详细一点快点!O(∩_∩)O谢谢
因为xy/x+y =3,
所以xy=3(x+y) (1)
将式子(1)代入求值式子:
2x-3xy+2y/-x+3xy-y
=2x-9x-9y+2y/-x+9x+9y-y
=-7x-7y/8x+8y
=-7/8
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