(1)1/5,1,4,,24,24A4B8C12D18(2)1,4,10,22,A44B46C64D68(3)3,4,5,10,9,28,17,A82B72C64D56(4)1/6,1/24,1/60,1/120,A1/210B1/220C1/230D1/240

Question

(1)1/5,1,4,,24,24
A 4 B 8 C 12 D 18
(2) 1,4,10,22,
A 44 B 46 C 64 D 68
(3) 3,4,5,10,9,28,17,
A 82 B 72 C 64 D 56
(4)1/6,1/24,1/60,1/120,
A 1/210 B 1/220 C 1/230 D 1/240

Answer 1

1 C
1/5 ×5=1
1 ×4=4
4 ×3=(12)
12 ×2=24
24 ×1=24
2 B
1×2+2=4
4×2*2=10
10×2+2=22
22×2+2=46
3 A
奇数项 3,5,9,17 +2+4+8
偶数项 4,10,28,
4*3-2=10
10*3-2=28
28*3-2=82
4 C
看分母
6= 2 * 3
24= 4 * 6
60= 5 * 12
120=6 * 24
= 7 * 48