Odpowiedzi

2009-12-04T21:50:34+01:00
2(x+1)<-x(x+1)
2x+2<-x²-x
2x+x²+x<-2
3x+x²<-2/:3
x+1/3x²>-2/3
2009-12-04T21:50:40+01:00
2(x+1)<-x(x+1)
2x+2×1<-x×x+x×1
2x+2<-(x²)+x//-2x
2<-(x²)-x
-(x²)-x>2
2009-12-04T21:52:12+01:00
2(x+1)<-x(x+1) <=> 2x+2<-x²-x <=> x²+3x<=>-2 <=> x²/3 + x <-2/3 <=>
x< -2/3 - x²/3