1)log (¼) x=-0,5 ⇒ x=(¼)^(-½)=√4=2
log(√3) 9=x, x=2*2*log₃3=4*1=4
Произведение корней = 4*2=8
2) log₃₁3-log(√2) 2-log₇(1/7)=log₃₁3-2*log₂2-(-1)*log₇7=log₃₁3-2+1=log₃₁3-1;
3) lgx=lg14-1/2lg49+3lg2=lg(2*7)-1/2*lg(7²)+3lg2=lg2+lg7-1/2*2lg7+3lg2=4lg2=lg(2⁴)=lg16
x=16