Mathematics
Senior High
なぜ写真のような式が出来上がるか教えてください。
45.=/n{2a + (n −1)d}
*
20
p.B1-39
←
n
(1) 初項a,公差dの等差数列{an} に対して,S,=2ar とおく
.
k=1
(ア) S10 を a dを用いて表せ。
1000-12-
(イ)
S10=-5,S168 であるとき, a, dの値を求めよ.また, S1,S2,
Answers
No answer yet
Were you able to resolve your confusion?
Users viewing this question
are also looking at these questions 😉
