a>0时,
-2<ax+b<2
(-2-b)/a<x<(2-b)/a
(-2-b)/a=1,(2-b)/a=5
a=1,b=-3(舍去);
a<0时,
-2<ax+b<2
(2-b)/a<x<(-2-b)/a
(2-b)/a=1,(-2-b)/a=5
a=-1,b=3.
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