1.
(3/4+2 3/8)*25,8=(6/8+2 3/8)*25,8=3 1/8 *25,8=3,125*25/8=80,625
2.
((11а)²-11а)/(11а²-а)=(11а(11а-1))/(а(11а-1))=11
3.
...............=√((65-56)(65+56))=√9*121=√9*√121=3*11=33
4.
............=(5х√х + 2х - 2х)/(х√х)=(5х√х)/(х√х)=5
5.
....................=5^0.36 * 25^0.32=5^0.36 * (5²)^0.32=5^0.36 * 5^0.64=5^1=5
6.
.................=(7m^30 + 11m^30)/(9m^30)=(18m^30)/(9m^30)=2
7.
.............=4 * 2=8