15道数学题,因式分解1.3(x-3)的三次方y-(1-x)的三次方Z2.2ab三次方-2ab3.(3m+2n)的平方-(m-n)的平方4.-x的平方-4y的平方+4xy5.3ax平方+6axy+3ay6.16a四次方+24a平方b平方+9b四次方7.25m平方-80m+648.4分之 x的平方

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