Question

Можете пожалуйста решить дроби, и ещё чтобы были общие множители 29/30+44/45,9/19-5/13,2/3-13/5,14/20+2/11,1/3-1/5,5/7+10/12,8/11+3/16,6/10-1/2,11/13-6/7,1/17+7/14,8/14+13/9,1/12+2/4,6/42+11/12,3/6+8/11,12/15-10,15,1/2-10/11,1/7-3/20,2/12-14/10,1/2-6/12,7/20-8/15

Answer 1

Как-то так.

Надеюсь видно.

Answer 2

Конечно, давайте посчитаем суммы и разности дробей с общими знаменателями:

1. (29/30) + (44/45) = (293/303) + (442/452) = (87/90) + (88/90) = (87 + 88)/90 = 175/90 = 35/18

2. (9/19) - (5/13) = (913/1913) - (519/1319) = (117/247) - (95/247) = (117 - 95)/247 = 22/247

3. (2/3) - (13/5) = (25/35) - (133/53) = (10/15) - (39/15) = (10 - 39)/15 = -29/15

4. (14/20) + (2/11) = (1411/2011) + (220/1120) = (154/220) + (40/220) = (154 + 40)/220 = 194/220 = 97/110

5. (1/3) - (1/5) = (5/15) - (3/15) = (5 - 3)/15 = 2/15

6. (5/7) + (10/12) = (512/712) + (107/127) = (60/84) + (70/84) = (60 + 70)/84 = 130/84 = 65/42

7. (8/11) + (3/16) = (816/1116) + (311/1611) = (128/176) + (33/176) = (128 + 33)/176 = 161/176

8. (6/10) - (1/2) = (62/102) - (110/210) = (12/20) - (10/20) = (12 - 10)/20 = 2/20 = 1/10

9. (11/13) - (6/7) = (117/137) - (613/713) = (77/91) - (78/91) = (77 - 78)/91 = -1/91

10. (1/17) + (7/14) = (114/1714) + (717/1417) = (14/238) + (119/238) = (14 + 119)/238 = 133/238 = 7/14 = 1/2

11. (8/14) + (13/9) = (89/149) + (1314/914) = (72/126) + (182/126) = (72 + 182)/126 = 254/126 = 127/63

12. (1/12) + (2/4) = (14/124) + (23/43) = (4/48) + (6/12) = (1/12) + (1/2) = 1/12 + 6/12 = 7/12

13. (6/42) + (11/12) = (612/4212) + (117/127) = (72/504) + (77/504) = (72 + 77)/504 = 149/504 = 37/126

14. (3/6) + (8/11) = (311/611) + (86/116) = (33/66) + (48/66) = (33 + 48)/66 = 81/66 = 27/22

15. (12/15) - 10/15 = (12 - 10)/15 = 2/15

16. (1/2) - (10/11) = (11/22) - (20/22) = (11 - 20)/22 = -9/22

17. (1/7) - (3/20) = (20/140) - (21/140) = (20 - 21)/140 = -1/140

18. (2/12) - (14/10) = (1/6) - (7/5) = (5/30) - (42/30) = (5 - 42)/30 = -37/30

19. (1/2) - (6/12) = (1/2) - (1/2) = 0

20. (7/20) - (8/15) = (21/60) - (32/60) = (21 - 32)/60 = -11/60

Теперь вы имеете результаты для каждой из дробей.