7/9^11/6+2/9*6/11
=7/9*6/11+2/9*6/11
=（7/9+2/9）*6/11
=6/11
5^5/7-5/7*1/5
=5*7/5-1/7
=7-1/7
=6又6/7
5/16+(7/16-1/4)^1/2
=5/16+7/32-1/8
=10/32+7/32-4/32
=13/32