(x+3y)(x-3y)-(x-3y)的平方
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(x+3y)(x-3y)-(x-3y)的平方
(x+3y)(x-3y)-(x-3y)的平方
(x+3y)(x-3y)-(x-3y)的平方
(x-3y)(x+3y-x+3y)=6xy-18y^2
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