(3a+2b)(2a-3b)-(a-2b)(2a-b) a=-1.5 b=1/4

问题描述:

(3a+2b)(2a-3b)-(a-2b)(2a-b) a=-1.5 b=1/4

=6a-9ab+4ab-6b-(2a-ab-4ab+2b) =4a-8b =4*(-1.5)-8*(1/4) =17/2