נתקעתי בסעיף ב'...
תודה רבה!
צחי.
log(25)x -3log(5)x/5 +2 = 0log(5)x / log(5)25 - 3 (log(5)x - log(5)5)) + 2 = 0log(5)x / 2 -3(log(5)x - 1) + 2 = 0log(5)x = tt/2 - 3(t-1)+2 = 0t/2 - 3t+3+2 = 0t/2 - 3t+5 = 0 /*2t-6t+10 = 0-5t = -10t=2 log(5)x = 2x = 5^2 = 25
log(25)x -3log(5)x/5 +2 = 0
log(5)x / log(5)25 - 3 (log(5)x - log(5)5)) + 2 = 0
log(5)x / 2 -3(log(5)x - 1) + 2 = 0
log(5)x = t
t/2 - 3(t-1)+2 = 0
t/2 - 3t+3+2 = 0
t/2 - 3t+5 = 0 /*2
t-6t+10 = 0-5t = -10t=2
log(5)x = 2
x = 5^2 = 25