Question

Все формулы за 8 класс

Answer 1

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Answer 2

Formulas for 8th Grade

Here are some formulas commonly used in 8th grade mathematics:

1. Distance, Speed, and Time Formula: - The formula for calculating distance is: `x(t) = x0 + v0xt + axt^2/2`. - In this formula, `x(t)` represents the distance traveled at time `t`, `x0` is the initial position, `v0` is the initial velocity, `a` is the acceleration, and `t` is the time.

2. Quadratic Formula: - The quadratic formula is used to find the solutions of a quadratic equation: `x = (-b ± √(b^2 - 4ac)) / (2a)`. - In this formula, `a`, `b`, and `c` are coefficients of the quadratic equation `ax^2 + bx + c = 0`, and `x` represents the solutions.

3. Area and Perimeter Formulas: - The formulas for calculating the area and perimeter of common shapes are as follows: - Rectangle: - Area: `A = length × width`. - Perimeter: `P = 2(length + width)`. - Triangle: - Area: `A = 0.5 × base × height`. - Perimeter: `P = side1 + side2 + side3`. - Circle: - Area: `A = πr^2` (where `π` is approximately 3.14159 and `r` is the radius). - Circumference: `C = 2πr`.

4. Mean (Average) Formula: - The formula for calculating the mean (average) of a set of numbers is: `mean = sum of all numbers / total count of numbers`. - To find the mean, add up all the numbers in the set and divide the sum by the total count of numbers.

These are just a few examples of formulas commonly used in 8th grade mathematics. There are many more formulas and concepts to explore in this subject. Let me know if you have any specific questions or if there's anything else I can help you with!