作业帮7+77+777+······+77······77(1111个7)后两位数字是
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7+77+777+······+77······77(1111个7)后两位数字是
7+77+777+······+77······77(1111个7)后两位数字是
7+77+777+······+77······77(1111个7)后两位数字是
7+77+777+······+77······77(1111个7)=7×（1+11+111+.）除了1意外,其他后两位都是11,共有1110个,11*1110=12210
（12210+1）*7=85477
后两位数字为77
由于77*1111=85547
所以后两位数字是47176的43次方-38的32次方是10的倍数吗？ 12的77次方+23的55次方能被5整除吗？是 不能为什么（1）6^n 的后一位数字是6 8^n 的后一位数字是8,4,2,6 8^32的后一位数字是6 结果的后一位数字是0. （2）2^n 的后一位数字是2,4,8,6 77/4的余数是1，2^77后一位数字是2 3^...
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由于77*1111=85547
所以后两位数字是47
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7+77+777+······+77······77(1111个7)后两位数字是
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