Verified answer

Bonsoir,

45)

                                      113/12

                             17/6               79/12

                     1/2               7/3                 17/4

             2/3           - 1/6              5/2                 7/4

2/3 - 1/6 = 4/6 - 1/6 = 3/6 = 1/2

- 1/6 + 5/2 = - 1/6 + 15/6 = 14/6 = 7/3

5/2 + 7/4 = 10/4 + 7/4 = 17/4

1/2 + 7/3 = 3/6 + 14/6 = 17/6

7/3 + 17/4 = 28/12 + 51/12 = 79/12

17/6 + 79/12 = 34/12 + 79/12 = 113/12

50)

1 - (1/5 + 3/25 + 3/10 + 1/5)

= (1 x 50) / (1 x 50) - [(1 x 10) / (5 x 10) + (3 x 2) / (25 x 2) + (3 x 5) / (10 x 5) + (1 x 10) / (5 x 10)]

= 50/50 - (10/50 + 6/50 + 15/50 + 10/50)

= 50/50 - 41/50

= 9/50