大括号里面 x²+2xy+y²=25 x²-y²-x-y=6

来源：学生作业帮编辑：大师作文网作业帮分类：数学作业时间：2024/11/13 09:23:07

(x+y)²=25 x+y=±5
(x+y)(x-y)-(x+y)=6 (x+y)(x-y-1)=6
若x+y=5,x=5/18 y=5/7
若x+y=-5,x=-5/13 y=-5/12

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