一共53种！
写个python程序
a=[]
for i in range(1,10):
for j in range(1,10):
if (i + j) >8:
a.append([i,j])
print a
print len(a)
[[1, 8], [1, 9], [2, 7], [2, 8], [2, 9], [3, 6], [3, 7], [3, 8], [3, 9], [4, 5], [4, 6], [4, 7], [4, 8], [4, 9], [5, 4], [5, 5], [5, 6], [5, 7], [5, 8], [5, 9], [6, 3], [6, 4], [6, 5], [6, 6], [6, 7], [6, 8], [6, 9], [7, 2], [7, 3], [7, 4], [7, 5], [7, 6], [7, 7], [7, 8], [7, 9], [8, 1], [8, 2], [8, 3], [8, 4], [8, 5], [8, 6], [8, 7], [8, 8], [8, 9], [9, 1], [9, 2], [9, 3], [9, 4], [9, 5], [9, 6], [9, 7], [9, 8], [9, 9]]
53
和大于8有24种不同的选法
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