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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)
Last Updated: 2001-11-14
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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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