Log7 (6-x) = 0 0 сноывние 7

l0g1/4 (15-2x) = - 3 основание1/4

log11 (7-5x) = log11 (3+x) + 1

Log₇ (6-x) = 0; ⇒ (6-x) >0;

7⁰ = (6-x) ; ⇒1 = (6-x) ;

x=6-1=5;

log₁/₄ (15-2x) = - 3; ⇒log₄⁻¹ (15-2x) = - 3;

-log₄ (15-2x) = - 3;

log₄ (15-2x) = 3; ⇒ (15-2x) >0;

4³=15-2x; ⇒64=15-2x;

2x=-49;

x=-24.5;

log₁₁ (7-5x) = log₁₁ (3+x) + 1; ⇒log₁₁ (7-5x) = log₁₁ (3+x) + log₁₁11;

log₁₁ (7-5x) = log₁₁11 (3+x) ; ⇒ (7-5x) >0; 5x<7; x0; 3>-x; x<3;

7-5x=11 (3+x) ; ⇒7-5x=33+11x;

-5x-11x=33-7;

-16x=26; x=-26/16; x=-1.625;