869. Решите уравнение: 1) 15,62 + x = 20; 2) 9,54 - x = 7,268; 3) x - 36,76 = 19,24; 4) x + 0,24 = 8,1.

Решение: 1) \(15,62 + x = 20\) => \(x = 20 - 15,62\) => \(x = 4,38\) 2) \(9,54 - x = 7,268\) => \(x = 9,54 - 7,268\) => \(x = 2,272\) 3) \(x - 36,76 = 19,24\) => \(x = 19,24 + 36,76\) => \(x = 56\) 4) \(x + 0,24 = 8,1\) => \(x = 8,1 - 0,24\) => \(x = 7,86\)