Cool Math has free online cool math lessons, cool math games and fun math activities. Really clear math lessons (pre-algebra, algebra, precalculus), cool math games, online graphing calculators, geometry art, fractals, polyhedra, parents and teachers areas too.

适合13岁以上喜欢数学的小朋友。

跟国外小朋友比一比,

谁能更聪明的解出这道题?!

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