√2, 2, 3, √17, 2√7, (A.6 B.7 C.√42 D.4√3

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问题 √2, 2, 3, √17, 2√7, (

选项 A.6
B.7
C.√42
D.4√3

答案C

解析作差 2 5 8 11 14,答案14+28=42
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