倍投是什么东西

简介：Relatively speaking, at the beginning of high school mathematics, the concepts are abstract, theorems are rigorous, logic is strong, the teaching materials are more rigorous and standardized, abstract thinking and spatial imagination are significantly improved, the knowledge is more difficult, there are many types of exercises, and problem-solving skills are flexible It is changeable and the calculation is complicated, which reflects the characteristics of high difficulty and large capacity.