desmos - 函数图形绘制
https://www.desmos.com/calculator
image.png
方程求解
https://www.mathportal.org/calculators/polynomials-solvers/polynomial-factoring-calculator.php
https://www.desmos.com/calculator
image.png
https://www.mathportal.org/calculators/polynomials-solvers/polynomial-factoring-calculator.php
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