2. Найди значения выражений: а) 2 - 1 2/5, б) 4 - 3 3/7, в) 2 5/9 - 2/3, г) 3,25 : 0,1.

а) 2 - 1 2/5 = 2 - (1 + 2/5) = (2 - 1) - 2/5 = 1 - 2/5 = 5/5 - 2/5 = 3/5. б) 4 - 3 3/7 = 4 - (3 + 3/7) = (4 - 3) - 3/7 = 1 - 3/7 = 7/7 - 3/7 = 4/7. в) 2 5/9 - 2/3 = (2 + 5/9) - 2/3 = 2 + 5/9 - 2/3 = 2 - 2 + 5/9 - 6/9 = -1/9. г) 3,25 : 0,1 = 32,5.