Question

A 10 = 20; d = –1. Найдите a1​

Answer 1

Ответ:

an = a1 + (n-1)*d
a10 = a1 + (10-1)*(-1)

20 = a1 - 9

a1 = 29

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Объяснение:

Answer 2

Ответ:

а10=а1+(10-1)(-1)

20=а1-9

а1=29

Answer 3

To find the value of a₁, we can use the formula for the nth term of an arithmetic sequence:

aₙ = a₁ + (n - 1)d

Given that A₁₀ = 20 and d = -1, we can substitute these values into the formula:

20 = a₁ + (10 - 1)(-1)

20 = a₁ + 9(-1)

20 = a₁ - 9

To isolate a₁, we can add 9 to both sides of the equation:

a₁ = 20 + 9

a₁ = 29

Therefore, a₁ = 29.