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问题: 初二数学题

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解答:

(1)
2x+xy=2-y;
xy+y=2-2x;
y=(2-2x)/(x+1)

(2)
x+1≠0;
x≠-1
∴x<-1或x<-1

(3)
f(1)=0
f(-7)=-8/3
f(0)=2