Mathematics
Senior High
(c)をできれば手書きで教えてください
② 次の和を求めよ。 (3点X3)
(a) 初項10, 公差4の等差数列の初項から第 ヵ 項までの和
(D や (642-7を+2) 6
ォ=1
でて)! NN NN
34+1
品 SV
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