Question

21. 2Какое число следующее вряду чисел? 1) 120, 140, 180, 240, 320, 2) 800, 750, 700, 650, 600,

Answer 1

1) 120, 140, 180, 240, 320, 420

Так как к первому числу прибавляют 20, ко второму 40, к третьему 60, к четвёртому 80, отсюда следуещее число получим прибавлением 100 к пятому

2) 800, 750, 700, 650, 600, 550

Так как каждое последующее число уменьшают на 50

Answer 2

1. In the first sequence, the pattern is an arithmetic sequence with a common difference of 20. Each number is obtained by adding 20 to the previous number.

120 + 20 = 140 140 + 20 = 160 160 + 20 = 180 180 + 20 = 200 200 + 20 = 220 220 + 20 = 240

So, the next number in the sequence would be 220 + 20 = 260.

Therefore, the next number in the first sequence is 260.

2. In the second sequence, the pattern is also an arithmetic sequence with a common difference of -50. Each number is obtained by subtracting 50 from the previous number.

800 - 50 = 750 750 - 50 = 700 700 - 50 = 650 650 - 50 = 600 600 - 50 = 550

So, the next number in the sequence would be 550 - 50 = 500.

Therefore, the next number in the second sequence is 500.