問題詳情
2.下列敘述何者正確？
(A) 816+815+814+813+811+812是一個等差級數。
(B) 2+4+6+8+...+98+100=(2+100)✖100÷2。
(C) 等差級數20+18+16+...... 中，公差為20-18=2 。
(D) 若將等差數列 a1, a2, a3, … , 
的每一項都加上10，形成一個新的數列，則新數列的總和比原數列的總和多20✖10 。
參考答案
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