Алгебра, 9 класс

Почитайте: 1) http://cos-cos.ru/math/151/#:~:text=%D0%94%D1%80%D0%BE%D0%B1%D0%BD%D0%BE%2D%D1%80%D0%B0%D1%86%D0%B8%D0%BE%D0%BD%D0%B0%D0%BB%D1%8C%D0%BD%D1%8B%D0%B5%20%D1%83%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F%20%E2%80%93%20%D1%83%D1%80%D0%B0%D0%B2%D0%BD%D0%B5%D0%BD%D0%B8%D1%8F%2C,%D0%B4%D1%80%D0%BE%D0%B1%D1%8C%20%D1%81%20%D0%BF%D0%B5%D1%80%D0%B5%D0%BC%D0%B5%D0%BD%D0%BD%D0%BE%D0%B9%20%D0%B2%20%D0%B7%D0%BD%D0%B0%D0%BC%D0%B5%D0%BD%D0%B0%D1%82%D0%B5%D0%BB%D0%B5. 2) https://www.yaklass.ru/p/algebra/8-klass/kvadratnye-uravneniia-11021/ratcionalnye-uravneniia-9118/re-11dca44f-4dfe-4615-b30c-bdc8d773d1ef