约分【2x²y(x-y)】/【12xy²(y-x)】
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约分【2x²y(x-y)】/【12xy²(y-x)】
(4a-4b)/(8a²-8b²)
(4a-4b)/(8a²-8b²)
![约分【2x²y(x-y)】/【12xy²(y-x)】](/uploads/image/z/19792608-24-8.jpg?t=%E7%BA%A6%E5%88%86%E3%80%902x%26%23178%3By%28x-y%29%E3%80%91%2F%E3%80%9012xy%26%23178%3B%28y-x%29%E3%80%91)
解
2x²y(x-y)/[12xy²(y-x)
=-2x²y(y-x)/[12xy²(y-x)]
=-x/6y
再问: (4a-4b)/(8a²-8b²)
再答: 解 (4a-4b)/(8a²-8b²) =4(a-b)/8(a²-b²) =(a-b)/2(a²-b²) =(a-b)/2(a-b)(a+b) =1/2(a+b)——(a+b)在分母位置
2x²y(x-y)/[12xy²(y-x)
=-2x²y(y-x)/[12xy²(y-x)]
=-x/6y
再问: (4a-4b)/(8a²-8b²)
再答: 解 (4a-4b)/(8a²-8b²) =4(a-b)/8(a²-b²) =(a-b)/2(a²-b²) =(a-b)/2(a-b)(a+b) =1/2(a+b)——(a+b)在分母位置