化简:7y(x-3y)²-(3y-x)²

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化简:7y(x-3y)²-(3y-x)²
化简:7y(x-3y)²-(3y-x)²

化简:7y(x-3y)²-(3y-x)²
7y(x-3y)²-(3y-x)²=7y(x-3y)²-(x-3y)²=(7y-1)(x-3y)²

=(7y-1)(x-3y)²