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
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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