3x*x+5xy-2y*y+x+9y-4
1个回答
因式分解=(3x-y)(x+2y)+x+9y-4
=(3x-y+a)(x+2y+b)
则,ab=-4,3b+a=1
所以,b=-1,a=4
所以,
=(3x-y+4)(x+2y-1)
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