因式分解x²+2xy-3y²+3x+y+2
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x²+2xy-3y²+3x+y+2
=(x+3y)(x-y)+(x+3y)+2x-2y+2
=(x+3y)(x-y+1)+2(x-y+1)
=(x-y+1)(x+3y+2)
=(x+3y)(x-y)+(x+3y)+2x-2y+2
=(x+3y)(x-y+1)+2(x-y+1)
=(x-y+1)(x+3y+2)
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