已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程
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已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程
![已知2x-y=10 【(x²+y²)-(x-y)²+2y(x-y)】÷4y 过程](/uploads/image/z/1543534-70-4.jpg?t=%E5%B7%B2%E7%9F%A52x-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+%E8%BF%87%E7%A8%8B)
【(x²+y²)-(x-y)²+2y(x-y)】÷4y
=(x²+y²-x²+2xy-y²+2xy-2y²)÷4y
=(4xy-2y²)÷4y
=x-y/2
=1/2(2x-y)
=10/2
=5
=(x²+y²-x²+2xy-y²+2xy-2y²)÷4y
=(4xy-2y²)÷4y
=x-y/2
=1/2(2x-y)
=10/2
=5
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