Log 1/3 x+log 1/3 y=2 log 1/3 x+log 1/3 y=4

1)   log 1/3 x + log 1/3 y=2

log  1/3 xy = 2

xy = 1/9

log 1/3  1/3  + log 1/3  1/3=2

1+1=2

2)    log 1/3 x+log 1/3 y=4 

log  1/3 xy = 4

xy=1/81

  log 1/3 1/9+log 1/3  1/9=4 

2+2=4

из треугольника ahc:

ch=ah*tg(a)=18*(1/3)=6

hc^2=ah*hb => hb=hc^2/ah=36/18=2

нв=2