1, parabola y = ax 2+bx+c (a ≠ 0). That is, y equals a times x plus the square of b times x plus C.

In the plane rectangular coordinate system, the opening is upward when a > 0 and downward when a < 0 (a = 0 is a linear function). When c > 0, the function image intersects with the positive direction of Y axis; when c < 0, the function image intersects with the negative direction of Y axis; when c = 0, the parabola crosses the origin; when b = 0, the parabola symmetry axis is the Y axis (of course, when a = 0 and b≠0, the function is a linear function).

2. Vertex formula y = a (x+h) * 2+k, (h, k) = (-b/(2a), (4ac-b 2)/(4a)). That is, y is equal to a times the square of (x+h)+k, h is the x of vertex coordinates, and k is the y of vertex coordinates, which is generally used to find the maximum and minimum values and the symmetry axis.

Generally speaking, the first few questions are easy. You can put four options in the question to see which answer is correct. According to statistics, the number of times that any question in multiple-choice questions and ABCD become the correct answer is 3-5 times. Then you can't write any questions, you must answer them all. You can't write all the same answers, so you won't get any points.

I can only write 1-2 questions, and the answers to the other questions are different from what I can write, so I can get at least 20 points. For example, if you can write a question and choose a question, you can write C or D for the question that 15 doesn't know how to write it. Know how to write more than three questions, see which option of ABCD appears less frequently in the answers you know how to write, and then write that option to the questions you don't know how to write, so you can get at least 30 points.

Reflections on the answers to fill-in-the-blank questions and short answers in adult college entrance examination;

Fill-in-the-blank questions usually appear, and the answer to one of them is likely to be 0, 1, 2. In fact, it is impossible to write every question, so you can write 0 or 1 or 2 for all four questions, but the probability of writing 1 is higher than that of writing 0,2. If you have enough time, you can try to put 0, 1 2 in a question whose answer may be an integer. If you are lucky, you can answer one or two questions correctly.

Don't give up the score of the solution if you don't understand it at all. The characteristic of the solution is to solve it layer by layer and finally get the answer. The answer step of solving a problem is to write the solution first, then write it according to the meaning of the question (write the known data in the question), calculate it according to the formula, and finally write the answer.