Question

2/5+1/8+3/4 b)11/6+3/4-1/2

Answer 1

a) 2/5 + 1/8 + 3/4
MMC de 5, 8 e 4 = 40
2/5/8 + 1/8/5 + 3/4/10 =
16/40 + 5/40 + 30/40 =
51/40
b) 11/6 + 3/4 - 1/2
MMC de 6, 4 e 2 = 12
11/6/2 + 3/4/3 - 1/2/6 =
22/12 + 9/12 - 6/12 =
31/12 - 6/12 =
25/12

Answer 2

a) 2/5 + 1/8 + 3/4
    5, 8, 4 | 2
    5, 4, 2 | 2
    5, 2, 1 | 2
    5, 1, 1 | 5                              
    1, 1, 1 | 2³ * 5 = 8 * 5 = 40
(16 + 5 + 30) / 40 
51/40

b) 11/6 + 3/4 - 1/2
    6, 4, 2 | 2
    3, 2, 1 | 2
    3, 1, 1 | 3                              
    1, 1, 1 | 2² * 3 = 4 * 3 = 12
(22 + 9 - 6) / 12
(31 - 6) / 12
25/12

Espero ter ajudado. Valeu!