问题描述: (一3m+2n)(-3m-2n) 1个回答 分类:综合 2014-11-27 问题解答: 我来补答 9mn-4n² 再答: 9m²-4n² 再答: 手机党第一次打错了再问: 再答: go jogging learn more about try beijing opera is looking forward to away from to get to 展开全文阅读