9 9 9 9 9 =219 9 9 9 9 =229 8 7 6 5 4 3 2 1 =10009 8 7 6 5 4 3 2 1 =19939 8 7 6 5 4 3 2 1 =1994
您再算算吧!这是等于20勒!