49/800,47/400,23/100,()
A.13/200
B.41/100
C.51/100
D.91/200
请帮忙给出正确答案和分析,谢谢!
1.5,4.5,13.5,16.5,() A.21.5 B.34.5 C.49.5 D.47.5
21,23,26,31,38,(),62。 A.47B.49C.51 D.53
1.5,4.5,13.5,16.5,() A.21.5 B.34.5 C.49.5 D.47.5
51,49,87,13,45,55,63,()A.67B.37C.47D.57
51,49,87,13,45,55,63,()A.67 B.37 C.47 D.57