Math 12 problem-solving skills replacement method in college entrance examination.
This series of methods often give some conditions, such as a greater than or equal to 0 and less than or equal to 1. B is greater than or equal to 1 and less than or equal to 2. Considering some special circumstances, it may be complicated for you to find some formulas for combining ab. But if it is a multiple-choice question, you can try a=0.5 and b= 1.5. There is also a formula that can bring the answers in the options to the questions to calculate, which is also called reverse calculation.
Interval method
This method, also called exclusion method, relies on roughly calculated data or guesses some data when answering multiple-choice questions in college entrance examination mathematics. For example, how many angles are given to a topic, 30 and 90. Obviously, the answer must be 90 30 degrees, 120 plus or minus 30 degrees. Or some answers related to 30, 60 or 90 degrees.
Coordinate method
If you can't find a way of thinking in some math graphics problems in the college entrance examination, you can use the proportional method first, and then use the coordinate method. You can directly find the coordinates of two points, without considering any trigonometric function, and directly bring in the formula of angle (cos formula), vertical line, length and tangent separation of high school functions. Go straight to Huanglong without looking for an angle to do anything troublesome.
ratio method
Proportional method is a simple rogue method for multiple-choice questions in mathematics in college entrance examination. If you encounter graphics problems, mark the known first, measure the unknown with a protractor, and then it is time to witness the miracle! ! ! The ruler measures the proportional relationship between two solid lines, and then the length of that side can be obtained by approximately estimating the ratio through the known edge.
equal division
Generally, in the college entrance examination paper, there are four options, namely 12 and ABCD, which are basically equally divided. It's not that more than half of the options in 12 multiple-choice questions are selected, and the four options are basically 25% each. Students can also get the answer according to this rule, so the probability of getting the correct answer will be greater.
When answering multiple-choice questions, you must fill in the blanks with a qualified 2B pencil. If you need to modify the answer, clean it with a drawing board, and be careful not to scratch the answer sheet. It is forbidden to use correction fluid, correction tape or transparent tape to correct mistakes.
Answers must be answered with 0.5 mm black ink pen, and drawing questions can be drawn with pencil first, and then clearly drawn with 0.5 mm black ink after confirmation.
Answer in the designated answer area according to the question number. If you need to modify the answer, you can cross out the content to be modified and write a new answer directly above or below. The modified part, like the text, cannot exceed the black rectangular border of the answer area, otherwise the modified answer is invalid.
Common mistakes or nonstandard answers to fill-in-the-blank questions include: illegible handwriting, nonstandard or incorrect writing of characters, nonstandard writing of scores, nonstandard writing of general terms and function expressions, correct writing of resolution function without indicating the definition domain, requiring the results to be written as a set without representation, and inaccurate description of the object attributes of the set.
On solving problems, candidates should not only provide the final conclusion, but also write down the main steps and provide reasonable and legal explanations. There is no such requirement for fill-in-the-blank questions, as long as the results are filled out, the results should be concise and accurate.
The answering process should be neat and beautiful, with clear logical thinking, accurate concept expression and key sentences and keywords.
For calculation problems or application problems with units, the final result must bring units, especially after solving the application problems, you must write "answers" that meet the meaning of the questions.