问题 填空题

分解因式:x2-y2+3x-y+2=______.

答案

x2-y2+3x-y+2 (x2-y2)+(x+y)+(2x-2y+2)

=(x+y)(x-y)+(x+y)+2(x-y+1)

=(x+y)(x-y+1)+2(x-y+1)

=(x-y+1)(x+y+2);

故答案为(x+y+2)(x-y+1).

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