Răspuns:
ex2:
log 3 9 = 2
log 2 8 =3
log 4 1/4= log 4 4^-1 =-1 log 4 4 = -1.
2-3=-1 <=> adevărat
ex3:
2log 3 4 = 2log 3 2^2 = 2*2log 3 2 = 4log 3 2
4log 3 2 - 4log 3 2 = 0.
ex4:
log 6 3*10:5= log 6 30:5= log 6 6 = 1.
ex5:
a=log 3 2
log 3 8*100:25= log 3 800:25= log 3 32= log 3 2^5= 5log 3 2 <=> 5a <=> adevărat
Explicație pas cu pas:
