（2a+b)(2a-b)+3(2a-b)^2+(-3a)(4a-3b)其中a=-1,b=2
人气：482 ℃ 时间：2020-04-15 03:22:01
解答
（2a+b)(2a-b)+3(2a-b)^2+(-3a)(4a-3b)
＝4a^2-b^2+12a^2-12ab+3b^2-12a^2+9ab
＝4a^2-3ab+2b^2
＝4+6+8＝18
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