ПСС, / - риска дробу 43/51 - (В - 1/51) = 42/51 СРОЧНО!
43/51 - (b - 1/51) = 42/51 43/51 - b + 1/51 = 42/51 44/51 - b = 42/51 b = 44/51 - 42/51 b = 2/51