化简(3b+2a)(3a+b)-6ab

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化简(3b+2a)(3a+b)-6ab

(3b+2a)(3a+b)-6ab
=9ab+3b^2+6a^2+2ab-6ab
=6a^2+5ab+3b^2

(3b+2a)(3a+b)-6ab
=9ab+3b²+6a²+2ab-6ab
=6a²+5ab+3b²