x²-y²+3x-7y=2
(x+y)(x-y)+3x-7y=2
(x+y)(x-y)-2(x+y)+5(x-y)=2
(x+y)(x-y)-2(x+y)+5(x-y)-10=-8
â´(x+y+5)(x-y-2)=-8
å 为x+y+5ä¸x-y-2çå¥å¶æ§ä¸åï¼
æ以ä¸åç§å¯è½
(1)x+y+5=1
x-y-2=-8
解å¾ï¼x=-5ï¼y=1
(2)x+y+5=-1
x-y-2=8
解å¾ï¼x=2ï¼y=-8
(3)x+y+5=8
x-y-2=-1
解å¾ï¼x=2ï¼y=1
(4)x+y+5=-8
x-y-2=1
解å¾ï¼x=-5ï¼y=-8
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