1д
√(56+6^log(6)25)+√((3/2+1/2)^5+68)=√(56+25)+√(32+68)=√81+√100=9+10=19
2б
3*5^log(5)9:25^log(25)27=3*9:27=1
2г
[(2log(2)3+1)²-4log²(2)3+3(2log(2)3+1)+6log(2)3)/(2log(2)3+1+2log(2)3)=
=(4log²(2)3+4log(2)3+1-4log(2)3+6log(2)3+3+6log(2)3)*(4log(2)3+1)=
=(16log(2)3+4)/(4log(2)3+1)=4(4log(2)3+1)=4
3a
(6^log(6)5)^log(6)5-5^log(6)5+4log(7)7-2log(7)7=5^log(6)5-5^log(6)5+4-2=2