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因為:六位數a2875b能被99整除,所以:六位數a2875b能被3整除,也是11的倍數,所以:a+2+8+7+5+b=22+a+b是3的倍數,且(a+8+5)-(2+7+b)=4+a-b是11的倍數;所以:a-b=7,因為:a、b是不大於9的自然數,所以:a=9,b=2或a=8,b=…
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