Mathematics
Senior High
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この２・3はどこから来たのですか？
見えた力
こってわか
(S)
a₁ + a₁ = 12
[3] a1+α4=12, aｭ+α7=18
RE
般項をそれぞれ求めよ
=−3+² (n − 1) = 37-3
[3] a₁+a₁=18
−)α₁+a₁=12
α7-a4=6.
α₁+A₁= a₁ + (a₁
2a₁+6=12
6 (S
公差 =
公差 = 7-4 = 2.
+2·3)=2a₁+67²7-5
α = 3. よって
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理解できました。ありがとうございます