Question

Testul nr 3, ambele variante
Rog urgent, am uitat de el

Answer 1

ttest3

a,lg(x+1)-lgx=2

x+1>0  x> -1

lg(x+1)/x=2

(x+1)/x=10²

(x+1)/x=100

x+1=100x

1=99x

x=1/99

b.log₁/₂x+log₁/₂(2x-1)=0

x>0      2x-1>0     x>1/2

log₁/₂x*(2x-1)=0=>

x(2x-1)=1

2x²-x-1=0

x1=-1/2<1/2

x2=1/2∈(1/2,+∞)

ecuatia nu are solutie

c. log₃x+logv₃x+log₁/₃x=5

x>0

d nu se vede

1/

Explicație pas cu pas: