1x1x1-2x2x2+3x3x3-4x4x4+5x5x5-6x6x6+...+29x29x29-30x30x30=?(要过程)

1小时内要答案
要过程!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!要过程!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!要过程!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!要过要过程!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!程!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!要过程!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

第1个回答  2009-11-10
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