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由已知得当c>0时,原不等式可化为1/c1/a
当c

Sorry!! 看不清图,你放大再发吧

c cannot be 0
if c>0 1/c>-b(c>0) we get 1>-bc(b>0) we get c>1/-b
1/c0) we get 10) we get c>1/a
since 1/-b smaller than 1/a we get c>1/a
if c<0 similarly we can get c<-1/b
therefore -b<1/c
1/a when c>0