50n-20n(x-y)+2n(x-y)^2因式分解
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50n-20n(x-y)+2n(x-y)^2因式分解50n-20n(x-y)+2n(x-y)^2因式分解50n-20n(x-y)+2n(x-y)^2因式分解提取公因式2(25n-10n(x-y)+n(
50n-20n(x-y)+2n(x-y)^2因式分解
50n-20n(x-y)+2n(x-y)^2因式分解
50n-20n(x-y)+2n(x-y)^2因式分解
提取公因式
2(25n-10n(x-y)+n(x-y)²)
=2(5n-n(x-y))(5-(x-y))
=2n(5-x+y)(5-x+y)
=2n(5-x+y)²
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