б) $$6\frac{1}{12} - k = 2\frac{5}{12}$$ k=200 x=4号 Ответ 4

б) $$6\frac{1}{12} - k = 2\frac{5}{12}$$ $$k = 6\frac{1}{12} - 2\frac{5}{12}$$ $$k = 5\frac{13}{12} - 2\frac{5}{12}$$ $$k = 3\frac{8}{12} = 3\frac{2}{3}$$ Ответ: $$3\frac{2}{3}$$