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数学公式计算器，和大家切磋！希望高手帮助改进功能，最好能够提供变量表达式计算，不是单纯的数字表达式计算，有兴趣的朋友可以跟我联系！-mathematical formula calculator, and to discuss the! Experts hope to help improve function, the best solution is to provide variable expression, not simply the number of formulas, the friends are interested can contact me!
