Реши цепочки вычислений: 500 − 240, :7, ·5, +500, :30, ·20, −360, :6; 44 ·2, :8, −71, ·8, +580, −730, :2, −335; 240 +180, :7, ·9, −516, :3, ·15, :12, ·100.

1-я цепочка:

1. 500 − 240 = 260.
2. 260 : 7 = \(37\frac{1}{7}\).
3. \(37\frac{1}{7}\) · 5 = \(185\frac{5}{7}\).
4. \(185\frac{5}{7}\) + 500 = \(685\frac{5}{7}\).
5. \(685\frac{5}{7}\) : 30 = \(22\frac{6}{35}\).
6. \(22\frac{6}{35}\) · 20 = \(448\frac{4}{7}\).
7. \(448\frac{4}{7}\) − 360 = \(88\frac{4}{7}\).
8. \(88\frac{4}{7}\) : 6 = \(14\frac{10}{21}\).

2-я цепочка:

1. 44 · 2 = 88.
2. 88 : 8 = 11.
3. 11 − 71 = −60.
4. −60 · 8 = −480.
5. −480 + 580 = 100.
6. 100 − 730 = −630.
7. −630 : 2 = −315.
8. −315 − 335 = −650.

3-я цепочка:

1. 240 + 180 = 420.
2. 420 : 7 = 60.
3. 60 · 9 = 540.
4. 540 − 516 = 24.
5. 24 : 3 = 8.
6. 8 · 15 = 120.
7. 120 : 12 = 10.
8. 10 · 100 = 1000.

Ответ: 1) \(14\frac{10}{21}\); 2) −650; 3) 1000.