经典例题
1.2, 4, 7, 13,24,44,81,( )
A.151
B.149
C.135
D.132
2.
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A.10B.9C.8D.7
3.4, 4,6, 12,( ), 90
A.24
B.26
C.28
D.30
答案解析
1.B【解析】所给数字两两一组,前一组数字之和等于下一组数字之差。2+4=13-7,7+13=44-24,24+44=(149)—81。
2.C【解析】上边三个数的和减去下边两个数的和等于中间的数。(7+9+1)-(4+3)=10,(8+5+6)-(7+2)=10,(5+8+2)-(6+1)=(8)。
3.D【解析】4÷4=1,6÷4=1.5,12÷6=2,(30)÷12=2.5,90÷(30)=3。商构成公差为0.5的等差数列。
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