1.3, 4, 12, 18, 44, ( )
A.44 B.56 C.78 D.79
2. 0.5, 1, 2, 5, 17, 107, ( )
A.1947 B.1945 C.1943 D.1941
3.23, 56, 1130, 5330, ( )
A.111580 B.112430 C.121540 D.111590
4.0,0,6,24,60,120,( )
A.180 B.196 C.210 D.216
5. 2, 14, 84, 420, 1680, ( )
A.2400 B.3360 C.4210 D.5040
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5.【答案】D。解析:倍數(shù)關系,每兩個數(shù)相差7,6,5,4,所以是3倍。