分解因式:3x²+5xy－2y²+x+9y－4

来源：学生作业学帮网编辑：学帮网时间：2024/05/21 11:13:16

=(3x²＋5xy－2y²)＋(x＋9y)－4
=(3x－y)(x＋2y)＋(x＋9y)－4
=[(3x－y)＋4]×[(x＋2y)－1]
=(3x－y＋4)(x＋2y－1)

3x²+5xy-2y²+x+9y-4
=(3x-y)(x+2y)+(x+9y)-4
=(3x-y+4)(x+2y-1)

3x²+5xy－2y²+x+9y－4
=(3x²＋5xy－2y²)＋(x＋9y)－4
=(3x－y)(x＋2y)＋(x＋9y)－4
=[(3x－y)＋4]×[(x＋2y)－1]
=(3x－y＋4)(x＋2y－1)