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... rove quickly!"
Sun Xing shook his head while taking a puff and said, "High school mathematics is neither too difficult nor too easy. In your case, if you want to improve your math grades, you can only start learning from high school freshman year, beginning by memorizing basic concepts and formulas."
"If we compare mathematics to constructing a skyscraper, then basic concepts and formulas are equivalent to the foundation. Only with a solid foundation can the skyscraper be built.. ...
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