2. 1
3.√2/2
4. 1/3
5.( 1)x=2, so the original formula =7/8.
(2) let m/n=k, because m >;; N, so k> 1
Then k 2-6k+ 1 = 0.
k=3+2√2
If you don't understand, you can ask and hope to adopt it.