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設最後兩位是x,y 99=9*11 若能被11整除,則 (0+6+y)-(2+0+x)=4+y-x可被11整除 y-x=7或-4 若能被9整除,則 2+0+0+6+x+y=8+x+y能被9整除 x+y=1或10 x=7,y=3 所以最後兩位是73
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