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Originally posted by 冷风无情 at 2005-5-7 10:42 AM: 证明:假设电话号码为abcdefgh,根据题意要求证明: [((1000a+100b+10c+d)*80+1)*250+(1000e+100f+10g+h)*2-250]/2=10000000a+1000000b+100000c+10000d+1000e+100f+10g+h 则: [((1000a+100b+10c+d)*80+ ...
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