If 2-m×, then is equal to

2-m × 1 / 2m = 1/4

= 1/2m × 1/2m = 1/4


= 1/4m = 1/4


= m = 1


1/14 {(4m)1/2 + (1/5m)-1}


= 1/14 {2 + 5}


= 1/14 × 7


=

34