2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y
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2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y
![2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y](/uploads/image/z/8493597-45-7.jpg?t=2x-y%3D10+%E3%80%90%EF%BC%88x%26sup2%3B%2By%26sup2%3B%EF%BC%89-%EF%BC%88x-y%29%26sup2%3B%2B2y%EF%BC%88x-y%EF%BC%89%E3%80%91%C3%B74y)
原式=(x²+y²-x²+2xy-y²+2xy-2y²)÷4y
=(4xy-2y²)÷4y
=(2x-y)/2
=10/2
=5
=(4xy-2y²)÷4y
=(2x-y)/2
=10/2
=5
已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程
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