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)²7y(x-3y)
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