4\30=2\15 - сократили на 2
а 21\27=7\9 - сократили на 3
(9*9) / (9*9) = 1
81 / 81 = 1
1 = 1
(99-9)/9 = 10
90/9 = 10
10 = 10
99 + (9/9) = 100
99 + 1 = 100
100 = 100
999/9 = 111
111 = 111
1. log(4)16+log(4)2+log(4)8=log(4)16*2*8=log(4)256=4
2. 7^(2-log(7)2)=7^2/7^(log(7)2)=49/2=24,5
3. log(5)25+log(5)1/5-log(5)125=log(5)25*(1/5)/125)=log(5)1/25=-2