Current location - Training Enrollment Network - Mathematics courses - High school mathematics analytic geometry topics, such as question 20 (2), the specific step is that Wenzhou Sanmao's paper is very urgent! ! Waiting online. Thank you.
High school mathematics analytic geometry topics, such as question 20 (2), the specific step is that Wenzhou Sanmao's paper is very urgent! ! Waiting online. Thank you.
( 1)f'(x)=[xe^x-(e^x- 1)]/x^2

=[(x- 1)e^x+ 1]/x^2,

Let h (x) = (x- 1) e x+ 1, then

h'(x)=xe^x,x>; 0 h'(x)>0, and h(x) is increasing function; X<0 h' (x) < 0, and h(x) is a decreasing function.

∴h(x)>; =h(0)=0,

∴f'(x)>; =0, f(x) is increasing function,

Let f (x) = e (2x)- 1-2xe x, x >;; So, 0

f'(x)=2e^(2x)-(2+2x)e^x=2e^x[e^x-( 1+x)]>; 0,

∴f(x)>; =F(0)=0,

∴f(n)>; 0,

∴[e^(2n)- 1]/(2n)>; e^n,

That is f(2n)>g(n)=f(m),

∴2n>; m & gt0,

∴n/m>; 1/2。