416. 11,22,33,45,(),71
A.55 B.56 C.57 D.58
解析:11 22 33 45 ? 71
11 11 12 12 14
45+12=57
417. 4,6,10,18,34,()
A.50 B.64 C.66 D.68
解析:2×4-2=6
2×9-2=10
2×10-2=18
2×18-2=34
2×34-2=66
418. 2,15,7,40,77,()
A.96 B.126 C.138 D.156
解析:做差
13 33 ()
13=4×2-3;
33=6×2-3;
()=8×2-3=61;
61+77=138 选C
419. 256,187,589,743,()
A.701 B.900 C.891 D.777
解析:2+5-6=1
1+8-7=2
5+8-9=4
7+4-3=8
8+9-1=16
420. 1,-1,-3,1,-15,()
A.58 B.225 C.79 D.193
解析:1^2-2=-1
(-1)^2-4=-3
(-3)^2-8=1
1^2-16=-15
(-15)^2-32=193
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