выполните действия: а) 5/8+7/8-1/8 б) 5/9-(4/9-1/9) в) 4 4/33+3 7/33 г) 5 13/18-2 7/18.

а) 5/8 + 7/8 - 1/8 = (5 + 7 – 1)/8 = 12/8 = 3/2 = 1,5. б) 5/9 - (4/9 - 1/9) = 5/9 – ((4 – 1)/9) = 5/9 – 3/9 = 2/9. в) 4(4/33) + 3(7/33) = 136/33 – 106/33 = 30/33 = 10/11. г) 5(13/18) – 2(7/18) = 103/28 – 43/18 = 60/18 = 10/3 = 3(1/3).