1.x^2+2x-15>0

问题描述:

1.x^2+2x-15>0
2.x^2>2x-1
3.x^2

1.x^2+2x-15>0
(x-3)(x+5)>0
x>3或x<-5
2.x^2>2x-1
x²-2x+1>0
(x-1)²>0
x>1
3.x^2