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

问题描述:

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

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