3, 5,5,6,6. 5,( )。
2023-06-09
A. 6. 25
B. 6. 5
C. 7.25
D. 7.5
参考答案:C
B. 6. 5
C. 7.25
D. 7.5
参考答案:C
数列的通项公式为(an十an+1)÷2 + 1 =an+2,即(3 + 5)÷2+1 = 5,(5 + 5) ÷ 2 + 1 = 6,(5 + 6) ÷2 + 1 = 6.5,故下一项为(6 + 6. 5) ÷ 2 + 1 = 7. 25,故本题选 C。
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