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Mathematical formula induction from grade one to grade three.
Math formula of senior one to senior three: 1, square difference formula: a? -B? =(a+b)(a-b).2. Complete square formula: a? +2ab+b? =(a+b)? . 3. Cubic sum formula: A? +b? =(a+b)(a? -ab+b? )。 4. Cubic difference formula: a? -B? =(a-b)(a? +ab+b? )。

Math formula of senior one to senior three: 1, square difference formula: a? -B? =(a+b)(a-b).

2. Complete square formula: a? +2ab+b? =(a+b)? .

3. Cubic sum formula: A? +b? =(a+b)(a? -ab+b? )。

4. Cubic difference formula: a? -B? =(a-b)(a? +ab+b? )。

5. Complete cubic sum formula: a? +3a? b+3ab? +b? =(a+b)? .

6. Complete cubic difference formula: a? -3a? b+3ab? -B? =(a-b)? .

7. Three complete square formulas: A? +b? +c? +2ab+2bc+2ac=(a+b+c)? .

8. the formula of cubic sum of three terms: a? +b? +c? -3abc=(a+b+c)(a? +b? +c? -ab-bc-ac).

Lateral area: S=c*h, the key mathematical formula for grades one to three.

Side area of oblique prism: S = c'* h

Side area of a regular pyramid: S= 1/2c*h'

Side area of prism: S = 1/2(c+c')h'

Area of frustum side: s =1/2 (c+c') l = pi (r+r) l.

Surface area of the ball: S=4pi*r2.

Area of cylinder side: s = c * h = 2pi * h

The lateral area of the cone: s =1/2 * c * l = pi * r * l.

Arc length formula: l=a*r.a is the radian number r >; of the central angle; 0

Sector area formula: s =1/2 * l * r.

Cone volume formula: V= 1/3*S*H

Cone 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

Acute angle formula of formulas of trigonometric functions trigonometric function in junior middle school

Opposite side/hypotenuse of sinα=∞α

Adjacent edge/hypotenuse of cosα=∞α

Opposite side of tanα = adjacent side of ∠ α/∠α.

Adjacent side of cotα = opposite side of ∠ α/∠α.

Double angle formula

Sin2A=2SinA? Kosa

cos2a=cosa^2-sina^2= 1-2sina^2=2cosa^2- 1

tan2A=(2tanA)/( 1-tanA^2)

(Note: Sina 2 is the square of Sina 2 (a))