(3x²-2x²-2y)÷(x+y) 化简【3x²-2x(x+y)+y(2x-y)】÷(x+y)其中x=1/2 y=1/3
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![(3x²-2x²-2y)÷(x+y) 化简【3x²-2x(x+y)+y(2x-y)】÷(x+y)其中x=1/2 y=1/3](/uploads/image/z/996517-37-7.jpg?t=%EF%BC%883x%26%23178%3B-2x%26%23178%3B-2y%EF%BC%89%C3%B7%EF%BC%88x%2By%EF%BC%89+%E5%8C%96%E7%AE%80%E3%80%903x%26%23178%3B-2x%EF%BC%88x%2By%EF%BC%89%2By%EF%BC%882x-y%EF%BC%89%E3%80%91%C3%B7%EF%BC%88x%2By%EF%BC%89%E5%85%B6%E4%B8%ADx%3D1%2F2+y%3D1%2F3)
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(3x²-2x²-2y)÷(x+y) 化简【3x²-2x(x+y)+y(2x-y)】÷(x+y)其中x=1/2 y=1/3
(3x²-2x²-2y)÷(x+y) 化简【3x²-2x(x+y)+y(2x-y)】÷(x+y)其中x=1/2 y=1/3
(3x²-2x²-2y)÷(x+y) 化简【3x²-2x(x+y)+y(2x-y)】÷(x+y)其中x=1/2 y=1/3
[3x2-2x(x+y)+y(2x-y)]÷(x+y)
=[x2-2x(x+y)+x2+2xy+y2+x2-2y2]÷(x+y)
=[x2-2x(x+y)+(x+y)2+x2-2y2]÷(x+y)
=[(x-(x+y))2+x2-2y2]÷(x+y)
=(x2-y2)÷(x+y)
=x-y
在将数据x=1/2 y=1/3代入计算即得:1/6.