The mathematical formula of senior high school entrance examination must include algebra, geometry, triangle, circle and other formulas.

I. Algebraic formula

1, square difference formula: (a+b)(a-b)=a? -B?

2. Square formula: (a b)? =a？ 2ab+b？

3. Cubic formula: A? +b？ =(a+b)(a？ -ab+b？ )，a？ -B? =(a-b)(a？ +ab+b？ )

4. multiplication formula: (a+b+c)(a? +b？ +c？ -ab-bc-ca)=a？ +b？ +c？ -3abc

Second, the geometric formula

1, area formula

Rectangular area, S=ab, parallelogram area, S=absinC, triangle area: S=( 1/2)absinC, trapezoid area: S=( 1/2)(a+b)h, circle area: S=πr?

2, perimeter formula

Rectangular perimeter: P=2(a+b), square perimeter: P=4a, and circular perimeter: c = 2π r.

Third, the triangle formula.

Pythagorean theorem: in a right triangle, the sum of squares of right angles is equal to the square of hypotenuse, that is, a? +b？ =c？

2. Inductive formula in triangle: a/sinA=b/sinB=c/sinC.

3. cosine theorem of triangle: c? =a？ +b？ -2abcosC

4. Sine theorem of triangle: a/sinA=b/sinB=c/sinC.

Fourth, the formula of circle.

Circumference of a circle: C=2πr, area of a circle: S=πr? , arc length: l=rθ, sector area: S=( 1/2)r? θ, cylinder volume: V=πr? H, cone volume: V=( 1/3)πr? H, sphere volume: V=(4/3)πr?

The above are some contents that must be memorized in the mathematical formula of the senior high school entrance examination. In the learning process, we should not only master these formulas skillfully, but also learn to use them flexibly to improve our problem-solving ability, so as to achieve good results in the exam.