问题描述: 4〔X-〕²-9〔X+1〕²=0 怎么算啊 1个回答 分类:数学 2014-12-10 问题解答: 我来补答 9(X-2)2 -16(X +1)2 = 0 [3(X-2)] 2 - [4(X +1)] 2 = 0 (3X-6 2)2 - (4×4)2 = 0 [(3×1-6)+(4×4)] [(3×1-6) - (4×4)] = 0 (7X- 2)(-X-10)= 0 然后:7倍-2 = 0或-x-10 = 0 得到:X = 2/7或x = -10 展开全文阅读