数学应注意的问题(Mathematics should pay attention to the problem).doc
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数学应注意的问题(Mathematics should pay attention to the problem)
The 9th grade of the college entrance examination module is easy to be wrong, easy to mix test 78 time: 2011-1-10 11:26:46 source: Chinese learning test channel author: unknown click: 132 times I want to comment (0)
One. Sets and functions
Do not forget the special circumstances of the whole set and the empty set, and dont forget to solve them using the number line and the Venn diagram.
2. When applying conditions, easy A ignores the empty set
Do you solve the problem with the idea of complement?
4. What is the difference between simple proposition and compound proposition? What is the relationship between the four propositions? How to determine the sufficient and necessary conditions?
5. You know the difference between no proposition and negative form of proposition.
Solving problems related to function is easy to ignore the principle of domain first.
When you judge a function parity, it is easy to ignore whether the validation domain is symmetric about the origin.
8. When the analytical formula of a function and the inverse function of a function are obtained, the domain of the function is easily ignored.
The original function is monotonically increasing in the interval [-a-a], there must be an inverse function, and the inverse function is monotonically increasing. But there is an inverse function of a function, which is not necessarily monotonous. For example:.
Have you mastered the proofs of the monotony of functions? Define the method (evaluate, make a difference, get the positive and negative) and the derivative method
11. To find the monotonicity of the function, it is easy to add the symbol union and or between the monotone intervals. The monotonic interval cannot be represented by a set or an inequality.
12. The scope of the function must be defined first.
13. How to apply the monotonicity and parity problem of functions? The size of the function value; Abstract function inequality; The range of para
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