Question

8/9+ 4/15;7/16-5/24;9/26-3/13;4 5/8-2 1/12;6 6/11+ 3 5/6;5 3/14 - 3 8/21.Заранее спасибо!Первые три -дроби ,а остальные смешанные числа.

Answer 1

8/9+4/15=40/45+12/45=52/45=1 7/45
7/16-5/24=21/48-10/48=11/48
9/26-3/13=9/26-6/26=3/26
4 5/8 -2 1/12=4 15/24- 2 2/24=2 13/24
6 6/11+3 5/6=6 36/66 +3 55/66=9 91/66=10 25/66
5 3/14-3 8/21=5 9/42-3 16/42=4 51/42-3 16/42=1 35/42=1 5/7

Answer 2

1) 8/9 + 4/15 = (8*15 + 4*9) / (9*15) = (120 + 36) / 135 = 156 / 135 = 52 / 45

2) 7/16 - 5/24 = (7*24 - 5*16) / (16*24) = (168 - 80) / 384 = 88 / 384 = 11 / 48

3) 9/26 - 3/13 = (9*13 - 3*26) / (26*13) = (117 - 78) / 338 = 39 / 338

4) 4 + 5/8 - 2 + 1/12 = (4 - 2) + (5/8 + 1/12) = 2 + (15/24 + 2/24) = 2 + 17/24 = 41/24

5) 6 + 6/11 + 3 + 5/6 = (6 + 3) + (6/11 + 5/6) = 9 + (36/66 + 55/66) = 9 + 91/66 = 175/66

6) 5 + 3/14 - 3 + 8/21 = (5 - 3) + (3/14 + 8/21) = 2 + (9/42 + 16/42) = 2 + 25/42 = 67/42

Надеюсь, это поможет!