解不等式-1<x²+2x-1<=2

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解不等式-1<x²+2x-1<=2解不等式-1<x²+2x-1<=2解不等式-1<x²+2x-1<=2-1<x²+2x-1<=2故x^2+2x>0得到x>0或x

解不等式-1<x²+2x-1<=2
解不等式-1<x²+2x-1<=2

解不等式-1<x²+2x-1<=2
-1<x²+2x-1<=2
故x^2+2x>0 得到x>0或x