问题描述： 因式分解4(3x^2-x-1)(x^2+2x-3)-(4x^2+x-4)^2谢谢 1个回答 分类：数学 2014-09-18 问题解答： 我来补答 4(3x^2-x-1)(x^2+2x-3)-(4x^2+x-4)^2=4(3x^2-x-1)(x^2+2x-3)-[(3x^2-x-1)+(x^2+2x-3)]2^=4(3x^2-x-1)(x^2+2x-3)-(3x^2-x-1)^2-2(3x^2-x-1)(x^2+2x-3)-(x^2+2x-3)^2=-(3x^2-x-1)^2+2(3x^2-x-1)(x^2+2x-3)-(x^2+2x-3)^2=-[(3x^2-x-1)-(x^2+2x-3)]^2=-(2x^2-3x+2)^2 展开全文阅读
