Mathematical formula that must be memorized in senior high school: the solution of quadratic equation in one variable
-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 equation has multiple yokes.
Senior high school must recite mathematical formulas: formulas for three-dimensional graphics and plane graphics.
The standard equation of a circle (x-a)2+(y-b)2=r2 Note: (A, B) is the center 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
Mathematical formulas that must be memorized in senior high school: formulas of figure perimeter, area and volume.
The circumference of a rectangle = (length+width)? 2
Perimeter of a square = side length? four
Area of rectangle = length? extensive
Area of a square = side length? Length of side
Area of triangle
Given that the base of a triangle is h, then S=ah/2.
Given the three sides A, B and C of a triangle and its half circumference P, then S=? [p(p-a)(p-b)(p-c)] (Helen 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.
Tisch
First, choose. 1. The sun rises in the east and sets in the west.
A. Of course B. Not necessarily C. No.
2. The dire