x平方+(2a+b)x+a平方+ab在实数范围因式分解
人气：434 ℃ 时间：2020-04-08 23:28:40
解答
十字相乘法
a^2+ab=a(a+b),而a+(a+b)=2a+b
所以原式=（x+a)(x+a+b)
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