Question

найди значения выражений а) 3/7*(1/3+4/9) б) 4/5-1/4:5/6

Answer 1

а)
3/7 * (1/3 + 4/9) =  3/7 * (3/9 + 4/9) = 3/7 * 7/9 = 3/9 = 1/3,
б)
4/5 - 1/4 : 5/6 = 4/5 - 1/4 * 6/5 = 4/5 - 3/10 = 8/10 - 3/10 = 5/10 = 1/2