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|x-y-1|+(xy+2)2=0求x,y的植.
题目详情
|x-y-1|+(xy+2)2=0求x,y的植.
▼优质解答
答案和解析
|x-y-1|+(xy+2)^2=0
x-y-1=0 =>x=y+1
xy+2=0
(y+1)y+2=0
y^2+y+2=0
无解.
是不是哪里写错了?比如xy+2改成xy-2
改了之后
(y+1)y-2=0
y^2+y-2=0
(y+2)(y-1)=0
y=-2时x=y+1=-1
y=1时x=y+1=2
x-y-1=0 =>x=y+1
xy+2=0
(y+1)y+2=0
y^2+y+2=0
无解.
是不是哪里写错了?比如xy+2改成xy-2
改了之后
(y+1)y-2=0
y^2+y-2=0
(y+2)(y-1)=0
y=-2时x=y+1=-1
y=1时x=y+1=2
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