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x²+xy-2y²+2x+7y-3
题目详情
x²+xy - 2y²+2x+7y -3
▼优质解答
答案和解析
原式=(x+2y)(x-y)+2x+7y-3
=(x+2y)(x-y)-x+y+3x+6y-3
=(x+2y)(x-y)-(x-y)+3x+6y-3
=(x-y)(x+2y-1)+3(x+2y-1)
=(x-y+3)(x+2y-1)
=(x+2y)(x-y)-x+y+3x+6y-3
=(x+2y)(x-y)-(x-y)+3x+6y-3
=(x-y)(x+2y-1)+3(x+2y-1)
=(x-y+3)(x+2y-1)
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