등비수열=a_n=ar^{n-1} 계차수열=a_n = a_1 + b_1 + b_2 + b_3 + ... + b_{n-1} b_n = b_1 + c_1 + c_2 + c_3 + ... + c_{n-1}
[무물보AI] 답변 로딩중...