But when it comes to problem-solving experience, ...
Tell me what I can remember now, hoping to learn from it.
First master the factorization formula, square difference, complete square, cubic sum, cubic difference, complete cube and cross multiplication.
If letters can't be decomposed into factors, make up constant terms (formula or cross multiplication); Take root
Encountered such as a 2-3a = 1.b 2-3b = 1,
A≠b, think that A and B are two roots of the equation X 2-3x- 1 = 0 about X, and so on.
In geometric proof, there is a triangle middle line and a side middle point (and so on). If you really can't figure it out, you can extend the midline (or make a parallelogram).
There are intersecting chords in a circle, and the intersection theorem is the last means to save the day.
Endpoints of equal line segments * * *, rotating; Vertex of complementary (complementary) two angles * * *, rotating.
The quantitative relationship between line segments (which can be extended to area) is difficult to define, which is similar to the exhaustion of congruence, like the triangle center of gravity theorem.
You can't understand the geometric proof problem, often because you don't fully understand the conditions of the problem ... At this time, look back. ...
Angular bisector: the most troublesome thing is that the area ratio and the bottom ratio can be found, and the distance from point to angle is equal; Draw a circle if the endpoints of the line segments are equal. Another three-in-one is always missed.
Chamfer the inverted line segment in the circle, grasp the proportion between arcs, and make good use of similarity and trigonometric function.
See a tangent, the vertical radius of conditioned reflex, see two tangents, and the tangent length of conditioned reflex (parallel ones are not counted …)
Maximum value and minimum value: cannot be solved by an analytical formula. Observe first, then list. ...
Function: I haven't found any special tricks so far-
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If a proof such as x 1
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Don't sum up too much at once, and don't talk about solutions without topics-
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In short ... do more difficult problems, and some laws will naturally come into play.
Where are you from? Look at the competition questions if you have the ability. I'm from Tianjin, and the title of the Tianjin competition is collapse!
Don't believe it, Baidu will know it. . .