(2a+3b)(3a-2b)-(4a-3b)^2+(a-b)(-a-b)快

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(2a+3b)(3a-2b)-(4a-3b)^2+(a-b)(-a-b)快(2a+3b)(3a-2b)-(4a-3b)^2+(a-b)(-a-b)快(2a+3b)(3a-2b)-(4a-3b)^2+(

(2a+3b)(3a-2b)-(4a-3b)^2+(a-b)(-a-b)快
(2a+3b)(3a-2b)-(4a-3b)^2+(a-b)(-a-b)

(2a+3b)(3a-2b)-(4a-3b)^2+(a-b)(-a-b)快
原式=6a²-4ab+9ab-6b²-(16a²-24ab+9b²)-a²-ab-ab-b²
=6a²-4ab+9ab-6b²-16a²+24ab-9b²-a²-ab-ab-b²
=27ab-11a²+2b²

(2a+3b)(3a-2b)-(4a-3b)^2+(a-b)(-a-b)
=6a²+5ab-6b²-16a²+24ab-9b²+b²-a²
=-11a²+29ab-14b²
=-(11a²-29ab+14b²)
=-(11a-7b)(a-2b)