решите уравнение 54 у-36 у-9=153 (15 и-21) * 3+27-=243 (36t+98) : 14=25 (12u+30U+42) : 6=21

Найдем корни.

1) 54 * у - 36 * у - 9 = 153;

54 * y - 36 * y = 153 + 9;

20 * y - 2 * y = 162;

18 * y = 162;

y = 162/18;

y = 81/9;

y = 9.

2) (15 * u - 21) * 3 + 27 = 243;

(15 * u - 21) * 3 = 243 - 27;

(15 * u - 21) * 3 = 216;

15 * u - 21 = 216/3;

15 * u - 21 = 72;

15 * u = 72 + 21;

15 * u = 93;

u = 93/15;

u = 6.2.

3) (36 * t + 98) / 14 = 25;

36 * t + 98 = 14 * 25;

36 * t = 14 * 25 - 98;

36 * t = 252;

t = 252/36;

t = 7.

4) (12 * u + 30 * u + 42) / 6 = 21;

(42 * u + 42) / 6 = 21;

42/6 * u + 42/6 = 21;

7 * u + 7 = 21;

7 * u = 21 - 7;

7 * u = 14;

u = 14/7;

u = 2.