化简:(x-3y)^2 -(x-3y)(x+3y)
1个回答
(x-3y)^2-(x-3y)(x+3y)
=(x-3y)[(x-3y)-(x+3y)]
=(x-3y)(x-3y-x-3y)
=(x-3y)(-6y)
=18y^2-6xy
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