已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值

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已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值
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已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值
已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值
已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值

已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值已知M=2x^2-6xy-2y^2,N=-x^2+1/2xy-2y^2 (1)求1/2M-2N,(2)若(x^2+y^2-2)^2+|2xy+1|=0,求1/2M-2N的值
1、3x^2-4xy+3y^2
2、x^2+y^2-2=0,x^2+y^2=2
2xy+1=0,2xy=-1
1/2M-2N=8

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