Ответ:
- 7 · 9 = 63; 7 · 8 = 56; 63 − 56 = 7; 10 · 7 = 70.
- 8 · 4 = 32; 8 · 6 = 48; 32 + 48 = 80; 80 − 80 = 0.
- 5 · 4 = 20; 20 : 10 = 2; 2 + 58 = 60.
- 8 + 42 = 50; 18 : 9 = 2; 2 · 50 = 100.
- 5 · 8 = 40; 8 · 6 = 48; 130 − 40 = 90; 90 + 48 = 138.
- 200 − 196 = 4; 24 : 4 = 6.
- 71 − 66 = 5; 14 − 8 = 6; 5 · 6 = 30.
- 23 − 14 = 9; 42 − 34 = 8; 9 · 8 = 72.
