-3x^2/x+1<0
小于0就是异号
①
-3x^2<0→x^2>0
x+1>0→x>-1
∴x>-1
②
-3x^2>0→x^2<0
x+1<0→x<-1
实数范围内无解
∴x>-1时,分式 -3x^2/(x+1) 的值为负
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