Пошаговое объяснение:
1) 8 3/4 - 7 5/6 = 8 9/12 - 7 10/12 = 7 21/12 - 7 10/12 = 11/12
2) 8 - 2 13/14 - 1 20/21 = 8 - (2 39/42 + 1 40/42) = 8 - 3 79/42 = 8 - 4 37/42 = 3 5/42
3) 10 21/25 - (8 1/5 - 4 7/10) = 10 21/25 - (8 2/10 - 4 7/10) = 10 21/25 - 3 1/2 = 10 42/50 - 3 25/50 = 7 17/50
1) 7 11/15 - 3 9/20 - 1 1/30 = 7 44/60 - 3 27/60 - 1 2/60 = 3 15/60 = 3 1/4
2) 10 - ( 5 4/5 - (8 3/4 - 8 7/15) - 3 5/12) = 7 9/10
по действиям
1) 8 3/4 - 8 7/15 = 8 45/60 - 8 28/60 = 17/60
2) 5 4/5 - 17/60 = 5 48/60 - 17/60 = 5 31/60
3) 5 31/60 - 3 5/12 = 5 31/60 - 3 25/60 = 2 6/60 = 2 1/10
4) 10 - 2 1/10 = 7 9/10
681306÷69 = 9874
1.
- 6 8 1 3 0 6 6 9
6 2 1 9 8 7 4 69 × 9 = 621
- 6 0 3 681 - 621 = 60
5 5 2 69 × 8 = 552
- 5 1 0 603 - 552 = 51
4 8 3 69 × 7 = 483
- 2 7 6 510 - 483 = 27
2 7 6 69 × 4 = 276
0 276 - 276 = 0
Проверка:
9874×69 = 681306
× 9 8 7 4
6 9
8 8 8 6 6
5 9 2 4 4
6 8 1 3 0 6
2.
454779÷507 = 897
- 4 5 4 7 7 9 5 0 7
4 0 5 6 8 9 7 507 × 8 = 4056
- 4 9 1 7 4547 - 4056 = 491
4 5 6 3 507 × 9 = 4563
- 3 5 4 9 4917 - 4563 = 354
3 5 4 9 507 × 7 = 3549
0 3549 - 3549 = 0
Проверка:
897×507 = 454779
× 8 9 7
5 0 7
6 2 7 9
4 4 8 5
4 5 4 7 7 9
Пошаговое объяснение:
