2x^2+5x-3因式分解两种方法
一：把-3拆分成两个数（-4+1）（或其他）
二：十字相乘法
人气：215 ℃ 时间：2019-12-25 05:38:31
解答
1、2x²+6x-x-3
=2x(x+3)-(x+3)
=(x+3)(2x-1)
2、1 3
×
2 -1
∴原式=(x+3)(2x-1)能不能详细讲解一下十字相乘咧，谢谢请网上找一些教程吧，这里讲不清楚
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