Б) 4^x-11=1/16
4^x-11=4^-2
x-11=-2
x=9
a) log3(7x-15)=3
log3(7x-15)=log3(27)
7x-15=27
7x=42
x=6
в) √13 - x = 3
x = √13 - 3
а) 9,4*10^3 + 2,2*10^2 = 9400+220 = 9620
б) 3^-4 * 3^3 : 3^-3 = 3^-4+3+3 = 3^2 = 9
в) log2(0,5) + log2(8) = -1 + 2 = 1
г) cos30° - ctg30° - sin30° = √3/2 - √3 - 1/2 = ( √3 - 2√3 -1)/2 = - ( √3+1)/2