Li Yanhua is a scumbag student. In order to respond to the International Federation's policy of eradicating all anti-party, anti-social and unprogressive scumbag students, he was forced to complete the five-year Star Examination and the three-year counterattack series of missions.
The first step is to lay a solid foundation
Li Yanhua: "Wait a minute, why are the linear equations tested in the imperial examination here?! The most difficult one is the quadratic equation?"
System: "(╬▔ Pan▔) Convex, lay a solid foundation. Do you understand? It sounds like you can survive by giving you an elliptic curve! Can you have some self-knowledge like a scumbag?"
The second step is to expand innovation
Li Yanhua: "This setting is too nonsense. No country would launch a war over trigonometric function deformation equations!"
System: "Have you learned the half-width formula? Have you finished the questions? Do you still want to pass the test and go home!"
"..."
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In short, this is a story about a scumbag who was forced to counterattack and become a top student.
It contains various problem-solving methods. In fact, elliptic curves can also be discussed (but no one will read it, right?!)