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
计算1/（1*4）+1/（4*7）+1/（7*10)+------+1/(97*100)································································································
数列7,77,777,7777,···的前n项和Sn?
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55*66+66*77+77*78+88*89简便运算要过程,急············
求乘积777····77（2001个7）*200120012001的各各数位上之和
1 2 3 4 ·····7 ·······10 ········?1 3 5 7 ·····?······?··········290 1 4 9 ·····?······?··········?
求···············
什么植物有应激性只要植物名 ·········································································································
急··························
急 ··············急············
这是什么蛾类昆虫?如题请给予回答···········································································