1. Let's denote x=1995. We need to compare the two fractions:
x1995+1x1994+1andx1996+1x1995+1
2. Consider the function f(x)=xn+1+1xn+1. We need to show that this function is decreasing for x>0.
3. To show that f(x) is decreasing, we can compute its derivative and show that it is negative for x>0.
4. The derivative of f(x) with respect to x is:
f′(x)=dxd(xn+1+1xn+1)
5. Using the quotient rule, we have:
f′(x)=(xn+1+1)2(xn+1+1)⋅dxd(xn+1)−(xn+1)⋅dxd(xn+1+1)
6. Simplifying the derivatives:
dxd(xn+1)=nxn−1
dxd(xn+1+1)=(n+1)xn
7. Substituting these into the derivative expression:
f′(x)=(xn+1+1)2(xn+1+1)⋅nxn−1−(xn+1)⋅(n+1)xn
8. Simplifying the numerator:
f′(x)=(xn+1+1)2nxn−1xn+1+nxn−1−(n+1)xnxn−(n+1)xn
f′(x)=(xn+1+1)2nx2n+nxn−1−(n+1)x2n−(n+1)xn
f′(x)=(xn+1+1)2nx2n+nxn−1−nx2n−x2n−(n+1)xn
f′(x)=(xn+1+1)2−x2n+nxn−1−(n+1)xn
9. Since x>0, the term −x2n dominates, making f′(x)<0. Therefore, f(x) is a decreasing function for x>0.
10. Applying this result to our specific case with x=1995, n=1994, and n+1=1995:
19951995+119951994+1>19951996+119951995+1
Conclusion:
19951995+119951994+1>19951996+119951995+1