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不用解方程,把 ( 7*7+2)^51 展开的时候,除了2^51 那项外,其他的各项都有 7*7, 可以把它们归纳成 7*A。

diao_david (LoveBeer)
(#261279@0)
2001-11-14 -04:00
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Back To Topic: 求教一GMAT数学题:如果今天是星期5,那51的51次方后是星期几。

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