不错的话结果是100x(1+100)/2=5050,
多出来18, 设正确是数是xy,那么 错的数是yx
10y+x=10x+y+18,
y-x=2,y=7,x=9
不错的话结果是100x(1+100)/2=5050,
多出来18, 设正确是数是xy,那么 错的数是yx
10y+x=10x+y+18,
y-x=2,y=7,x=9
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