求数列:6,18,( )78,126
A.40 B.41 C.42 D.44
人气:157 ℃ 时间:2019-12-01 10:46:33
解答
6 18 42 78 126
18-6=12
42-18=24
78-42=36
126-78=48
12 24 36 48 四数相差均为12
答案为:42
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