(3a-2b)(b-3a)-(2a-b)(3a+b)啊啊、如题、急\\\

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(3a-2b)(b-3a)-(2a-b)(3a+b)啊啊、如题、急\\\
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(3a-2b)(b-3a)-(2a-b)(3a+b)啊啊、如题、急\\\
(3a-2b)(b-3a)-(2a-b)(3a+b)
啊啊、如题、
急\\\

(3a-2b)(b-3a)-(2a-b)(3a+b)啊啊、如题、急\\\
=3ab-9a^2-2b^2+6ab-6a^2-2ab+3ab+b^2
=10ab-15a^2-b^2

-(3a+b)(5a-3b)

3ab-2b方-9a方+6ab-6a方-2ab+3ab+b方
=10ab-b方-15a方

3a*b-9a*a-2b*b+6a*b-(6a*a+2a*b-3a*b-b*b)
=3a*b-9a*a-2b*b+6a*b-6a*a-2a*b+3a*b+b*b
=10a*b-15a*a-b*b
其实很简单的,你要好好学呦