desmos - 函数图形绘制
https://www.desmos.com/calculator
![](https://img.haomeiwen.com/i2746450/0eaa2965cc7cd361.png)
方程求解
https://www.mathportal.org/calculators/polynomials-solvers/polynomial-factoring-calculator.php
https://www.desmos.com/calculator
https://www.mathportal.org/calculators/polynomials-solvers/polynomial-factoring-calculator.php
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