解不等式(y+2)²-(3+y)(y-3)
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解不等式(y+2)²-(3+y)(y-3)
解不等式(y+2)²-(3+y)(y-3)
解不等式(y+2)²-(3+y)(y-3)
(y+2)²-(3+y)(y-3)
(y+2)²-(3+y)(y-3)<1
y^2+4y+4-(y^2-9)<1
y^2+4y+4-y^2+9-1<0
4y+12<0
4y<-12
y<-3
y²+4y+4-(y²-9)<1
4y<-12
y<-3
(y+2)²-(3+y)(y-3)<1
y²+4y+4-(y²-9)<1
4y+13<1
y<-3