Question

比较a^2x方-1与a^x方+2 (a>0,a不等于1)的大小

Answer 1

(2x^2-1)-(x^2+2)

=x^2-3

所以x>√3和x0,2x^2-1>x^2+2

x=√3或x=-√3时,2x^2-1=x^2+2

-√3