А) а*948-6390=429690; б) 273996:б+15764=16151; в) (50-х) : 7+195=40*5; г) (270:у-2) * 30=7*120. Решить уравнения.

a * 948 - 6390 = 429690;

a * 948 = 429690 + 6390;

a = (429690 + 6390) / 948;

a = 436080/948 = 460;

273996/b + 15764 = 16151;

273996/b = 16151 - 15764;

b = 273996 / (16151 - 15764);

b = 273996/387;

b = 708;

(50 - x) / 7 + 195 = 40 * 5;

(50 - x) / 7 = 40 * 5 - 195;

50 - x = (40 * 5 - 195) 7;

x = 50 - (40 * 5 - 195) 7;

x = 50 - 35 = 15;

(270/у - 2) * 30 = 7 * 120;

270/у - 2 = (7 * 120) / 30;

270/у = (7 * 120) / 30 + 2;

y = 270 / ((7 * 120) / 30 + 2);

y = 270 / (780/30 + 2);

y = 270 / 30;

y = 9.

Ответ: 460; 708; 15; 9.