Question

Показательные уравнения. Решите 5 примеров.

Answer 1

Ответ:

$1 ) {4}^{4x - 17} = 64 \\ {4}^{4x - 17} = {4}^{3} \\ 4x - 17 = 3 \\ 4x = 3 + 17 \\ 4x = 20 \\ x = 5 \\ 2) {5}^{2x - 8} = 25 \\ {5}^{2x - 8} = {5}^{2} \\ 2x - 8 = 2 \\ 2x = 2 + 8 \\ 2x = 10 \\ x = 5 \\ 3)0.25 {}^{3x - 10} = 4 \\ {2}^{ - 6x + 20} = {2}^{2} \\ - 6x + 20 = 2 \\ - 6x = 2 - 20 \\ - 6x = - 18 \\ x = 3 \\ 4) {2}^{5x - 4} = {16}^{x + 3} \\ {2}^{5x - 4} = {2}^{4x + 12} \\ 5x - 4 = 4x + 12 \\ 5x - 4x = 12 + 4 \\ x = 16 \\ 5) {3}^{5x + 2} = {81}^{x - 1} \\ {3}^{5x + 2} = {3}^{4x - 4} \\ 5x + 2 = 4x - 4 \\ 5x - 4x = - 4 - 2 \\ x = - 6$