11.13 a) log (1/2)4=-2 log(3)9=2 log (4)1/4=-1
-2*2/-1=4
b)log(√3) 3√3=3log(3)3^4/3=3*4/3log(3)3=4*1=4
log(1/7)√49=log(1/7)7=-1
log(5)√5=log(5)5^1/2=1/2log(5)5=1/2*1=1/2
(4/-1)*1/2=-4*1/2=-2
11.14 a)2^log(2)5*2²=5*4=20
b) 5^log(5)16/5=16/5=3,2
11.10
log(1/2)x=log(1/2)(19/38*3)
Log(1/2)x=log(1/2)1,5
x=1.5
log(0,2)x=log(0,2)(93*4/31)
log(0.2)x=log(0,2)12
x=12
lgx=lg7²/27*8
lgx=lg14целых14/27
x=14целых13/27
lgx=lg3²*6/3
lgx=lg18
x=18
11.12 2*3=6
3/2=1,5