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(2x+y/x^2-2xy+y^2)*(x-y)
=2x+y/(x-y)^2*(x-y)
=2x+y/x-y
x-3y=0....x=3y
将x=3y带入2x+y/x-y
=6y+y/3y-y
=7/2(二分之七)
=2x+y/(x-y)^2*(x-y)
=2x+y/x-y
x-3y=0....x=3y
将x=3y带入2x+y/x-y
=6y+y/3y-y
=7/2(二分之七)
参考资料: http://wenwen.soso.com/z/q121002983.htm
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展开全部
x-3y=0
x=3y
(2x+y/x^2-2xy+y^2)*(x-y)
=(2x+y)/(x-y)^2 *(x-y)
=(2x+y)/(x-y)
=(6y+y)/(3y-y)
=7/2
x=3y
(2x+y/x^2-2xy+y^2)*(x-y)
=(2x+y)/(x-y)^2 *(x-y)
=(2x+y)/(x-y)
=(6y+y)/(3y-y)
=7/2
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