Question

A3=3, a5=33. d=? S20=?​

Answer 1

Ответ:

d = 15

S₂₀ = 2310

Объяснение:

$></p> <p>a₄ = a₃ + d</p> <p>a₅ = a₄ +d</p> <p>a₅ = a₃ + 2d</p> <p>d = (a₅-a₃)/2 = (33-3)/2 = 15</p> <p>a₁ = a₃ - 2d = 3 - 30 = -27</p> <p> <img src=$

$S_{20} = \frac{2*(-27) + 19*15}{2} *20 = 10*(285-54) = 2310$

Answer 2

It seems like you're providing a sequence of numbers, but the pattern or rule governing this sequence is not clear. Specifically, you've mentioned that A3 = 3 and A5 = 33, but you haven't specified how the numbers in this sequence are generated or what the sequence is.

Similarly, you've mentioned S20 without specifying what it represents or how it's calculated. To provide you with the values of d and S20, I would need more information about the sequence or pattern you're referring to.

Please provide additional details or clarify the pattern, and I'll be happy to assist you further.