105/60,98/96,91/52,84/48,(),21/12 A.77/42 B.76/44 C.62/36 D.7/4 答案为什么是D?
问题描述:
105/60,98/96,91/52,84/48,(),21/12 A.77/42 B.76/44 C.62/36 D.7/4 答案为什么是D?
答
就前四对数来看:把两个数相加个位数依次为5,4,3,2所以选D最后一对数.看不懂了