High school science mathematics formula daquan
-b+√(b2-4ac)/2a-b-√(b2-4ac)/2a
The relationship between root and coefficient x1+x2 =-b/ax1* x2 = c/a Note: Vieta theorem.
Discriminant b2-4a=0 Note: The equation has two equal real roots.
B2-4ac > Note: The equation has two unequal real roots.
B2-4ac & lt； 0 Note: The standard equation (x-a)2+(y-b)2=r2 last contact with * * * yoke Note: (A, B) is the central coordinate.
General equation of circle x2+y2+Dx+Ey+F=0 Note: D2+E2-4f > 0
Parabolic standard equation y2 = 2 pxy 2 =-2 pxy 2 = 2 pxy 2 =-2py.
Lateral area of a straight prism S=c*h lateral area of an oblique prism s = c' * h.
Lateral area of a regular pyramid S= 1/2c*h' lateral area of a regular prism S= 1/2(c+c')h'
The lateral area of the frustum of a cone S = 1/2(c+c')l = pi(R+R)l The surface area of the ball S=4pi*r2.
Lateral area of cylinder S=c*h=2pi*h lateral area of cone s =1/2 * c * l = pi * r * l.
The arc length formula l=a*ra is the radian number r > of the central angle; 0 sector area formula s= 1/2*l*r
Conical volume formula V= 1/3*S*H Conical volume formula V= 1/3*pi*r2h
Oblique prism volume V=S'L Note: where s' is the straight cross-sectional area and l is the side length.
Cylinder volume formula V=s*h cylinder V=pi*r2h
The circumference of a rectangle = (length+width) ×2
Circumference of a square = side length ×4
Area of rectangle = length × width
Area of a square = side length × side length
Area of triangle
Given that the base of a triangle is h, then S=ah/2.
Given three sides A, B, C and half circumference P of a triangle, then S=√[p(p-a)(p-b)(p-c)] (Helen's formula) (p=(a+b+c)/2).
And: (a+b+c)*(a+b-c)* 1/4.
Given the angle c between two sides a and b of a triangle, S=absinC/2.
Let the three sides of a triangle be A, B and C respectively, and the radius of the inscribed circle be R.
Then the triangle area =(a+b+c)r/2.
Let the three sides of a triangle be A, B and C respectively, and the radius of the circumscribed circle be R.
Triangle area =abc/4r.
Expanding reading: a way to learn mathematics
Look at your notes before you do your homework.
Some senior one students feel that they have heard what the teacher said clearly. But why is it so difficult to do the problem by yourself? The reason is that students' understanding of what the teacher said did not reach the level required by the teacher.
Therefore, before you do your homework every day, you must take a look at the relevant contents of the textbook and the class notes of that day. Whether you can stick to this point is often the biggest difference between good students and poor students. Especially when the exercises are not matched, there are often no questions in the homework that the teacher just talked about, so it is impossible to compare and digest them. If we don't pay attention to this realization, it will cause great losses over time.
Strengthen reflection after doing the problem
Students must make it clear that the topic they are doing now is definitely not the topic of the exam. But to use ideas and methods to solve the problems we are doing now. So we should reflect on every question we have done and sum up our gains.
To sum up: what is the content of this question and what method is used. Turn knowledge into pieces and questions into strings. Over time, build a scientific network content and method system. As the saying goes, "money is hard to buy." It is very valuable to look back carefully after finishing your homework. Review is a very important link in the learning process.
See if you did it right; What other solutions are there? Where is the topic in the knowledge system? What is the essence of the solution; Whether what is known and what is sought in the topic can be interchanged, and whether it can be added or deleted appropriately. With the above five reviews, students' problem-solving ability can increase day by day. Although the time invested is very small, the effect is great. Can be called twice the result with half the effort.
Review and summarize actively.
It is very important to summarize the chapters. In junior high school, it is the teacher who gives the students a summary, which is meticulous, profound and complete. In the third year of senior high school, I made my own summary, but the teacher not only refused to do it, but also said where to take the exam, where to take the exam, leaving no review time, and did not clearly point out the time to make the summary.