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- 1it's impossible that one person doesn't make any (mistakes)all his life.
- 2化简:1/X(X+1) +1/(X+1)+(X+2) +1/(X+2)(X+3) +.+1/(X+2006)(X+2007)
- 3Tears__the little match girl's eyes as she thought of her kind grandfather
- 45ab(3a平方b-2b的平方+4a)
- 5一张边长为2米的正方形纸,如果在这张纸上剪去一个最大的圆,这张纸的利用率是多少?
- 6哥哥今年31岁,哥哥像弟弟这么大年龄时弟弟才15岁,问弟弟今年多少岁?
- 7一公斤等于多少斤
- 8鸡兔同笼,共有 30 个头,88 只脚.求笼中鸡兔各有多少只?
- 9名言诗句积累
- 10已知p,q属于R,且p^2+q^2=2,求证p+q≤2 反证法证明