(4,13) (7,22) (10,31) (13,40) ( ) A. (15,45)B. (16,49)C. (16,51)D. (15,49)
(4,13) (7,22) (10,31) (13,40) ( )
A. (15,45)
B. (16,49)
C. (16,51)
D. (15,49)
B. (16,49)
C. (16,51)
D. (15,49)
参考解析
解析:解题指导: 每组两数之差分别为9,15,21,27,(33)。故答案为B。