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Cool Math - free online cool math lessons
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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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