The suggestion is to analyze your own knowledge structure, find those knowledge points that have lost serious points, and then decompose them one by one, aiming at your weak modules, and reread this part of books and exercises.
Specific measures: prepare the wrong question book, the specific format is: wrong question+problem solving process+error analysis+harvest summary. Take time to look before each exam, and the foundation will be consolidated over time. My experience is very effective. )
I hope it helps you. I wish you progress in your studies and a happy New Year.
As shown in the figure, parallel lines AB and CD with point C as a straight line are what you want. Specific practices are as follows:
Connect AC, l