已知(4x-y-1)²+根号下x+y-2=0 求4x²y-4xy-xy²
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已知(4x-y-1)²+根号下x+y-2=0 求4x²y-4xy-xy²
![已知(4x-y-1)²+根号下x+y-2=0 求4x²y-4xy-xy²](/uploads/image/z/7127214-6-4.jpg?t=%E5%B7%B2%E7%9F%A5%EF%BC%884x-y-1%EF%BC%89%26%23178%3B%2B%E6%A0%B9%E5%8F%B7%E4%B8%8Bx%2By-2%3D0+%E6%B1%824x%26%23178%3By-4xy-xy%26%23178%3B)
(4x-y-1)²+根号下x+y-2=0
4x-y-1=0
x+y-2=0
x=3/5,y=7/5
4x^2y-4xy-xy^2
=xy(4x-4-y)
=3/5*7/5*(12/5-4-7/5)
=21/25*(-3)
=-63/25
4x-y-1=0
x+y-2=0
x=3/5,y=7/5
4x^2y-4xy-xy^2
=xy(4x-4-y)
=3/5*7/5*(12/5-4-7/5)
=21/25*(-3)
=-63/25
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