ответ:1) 281*32 2)179*12 3)236*27 4)89*12 5)510*30 6)768:2; 7)805:7 8)792:4 9)756:3 10)684:4.
Пошаговое объяснение:1) 2)
1)× 2 8 1
3 2
5 6 2
8 4 3
8 9 9 2
2)
× 1 7 9
1 2
3 5 8
1 7 9
2 1 4 8
3)× 2 3 6
2 7
1 6 5 2
4 7 2
6 3 7 2
4)
× 8 9
1 2
1 7 8
8 9
1 0 6 8
5)
× 5 1 0
3 0
1 5 3 0 0
6) 7 6 8 2
6 3 8 4 2 × 3 = 6
- 1 6 7 - 6 = 1
1 6 2 × 8 = 16
- 8 16 - 16 = 0
8 2 × 4 = 8
0
7)8 0 5 7
7 1 1 5 7 × 1 = 7
- 1 0 8 - 7 = 1
7 7 × 1 = 7
- 3 5 10 - 7 = 3
3 5 7 × 5 = 35
0 35 - 35 = 0
8)7 9 2 4
4 1 9 8 4 × 1 = 4
- 3 9 7 - 4 = 3
3 6 4 × 9 = 36
- 3 2 39 - 36 = 3
3 2 4 × 8 = 32
0 32 - 32 = 0
9)7 5 6 3
6 2 5 2 3 × 2 = 6
- 1 5 7 - 6 = 1
1 5 3 × 5 = 15
- 6 15 - 15 = 0
6 3 × 2 = 6
0 6 - 6 = 0
10) 6 8 4 4
4 1 7 1 4 × 1 = 4
- 2 8 6 - 4 = 2
2 8 4 × 7 = 28
- 4 28 - 28 = 0
4 4 × 1 = 4
0 4 - 4 = 0
Справка:
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(a ± b)² = a² ± 2ab + b²
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Решение:
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