(3a+2b)²-(3a-4b)²怎么做?

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(3a+2b)²-(3a-4b)²怎么做?

(3a+2b)²-(3a-4b)²怎么做?
(3a+2b)²-(3a-4b)²怎么做?

(3a+2b)²-(3a-4b)²怎么做?
=3a²+2b²-3a²+4b²
=2b²+4b²
=6b²