How difficult is the mathematics of Yunnan college entrance examination in 2020? The fourth question of science in the third volume of the whole country is based on the dynamic study of epidemic spread in COVID-19. Logistic model suitable for students' knowledge level is selected as the basis of the life system of the test paper, and students' understanding and mastery of the basic knowledge of exponential function and their ability to solve practical problems by using mathematical models are investigated.
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