Răspuns:
1. \((4 + 3) \times 7 = 7 \times 7 = 49\)
2. \(7 \times (6+4) = 7 \times 10 = 70\)
3. \((8+7) \times 9 = 15 \times 9 = 135\)
4. \((2+9) \times 6 = 11 \times 6 = 66\)
5. \((10-3) \times 6 = 7 \times 6 = 42\)
6. \((26-3) \times 7 = 23 \times 7 = 161\)
7. \((1 000-990) \times 10 = 10 \times 10 = 100\)
8. \(8 \times (100-25) = 8 \times 75 = 600\)
9. \((45+15) : 10 = 60 : 10 = 6\)
10. \((100-19) : 9 = 81 : 9 = 9\)
11. \((27+8) : 7 = 35 : 7 = 5\)
12. \((90-34) : 8 = 56 : 8 = 7\)