Question

3/5 *(-10/21)= -2*4,8+(-5):(-2 1/2)= С решением!

Answer 1

Ответ:

-2/7

-7,6

Пошаговое объяснение:

3/5 * (-10/21) = 3*-10/5 * 21 = -2/7

-2*4,8 + (-5)/(-2 1/2) = -9,6 + 2 = -7,6

Answer 2

To solve the expressions, follow the order of operations (PEMDAS/BODMAS) which stands for Parentheses/Brackets, Exponents/Orders, Multiplication and Division (from left to right), and Addition and Subtraction (from left to right).

Let's break down each expression step by step:

1. 3/5 * (-10/21): To multiply fractions, simply multiply the numerators together and the denominators together. (3 * -10) / (5 * 21) = -30 / 105 Now, we can simplify the fraction by dividing both the numerator and the denominator by their greatest common divisor (GCD), which is 15. (-30 ÷ 15) / (105 ÷ 15) = -2/7

   So, 3/5 * (-10/21) = -2/7

2. -2 * 4.8 + (-5) / (-2 1/2): First, perform the multiplication: -2 * 4.8 = -9.6

   Next, convert the mixed number (-2 1/2) to an improper fraction: -2 1/2 = -(5/2)

   Now, perform the division: (-5) / (-(5/2)) = -5 / -(5/2) = -5 * -(2/5) = 2

   Finally, add the results: -9.6 + 2 = -7.6

   So, -2 * 4.8 + (-5) / (-2 1/2) = -7.6

The final solutions are:

1. 3/5 * (-10/21) = -2/7
2. -2 * 4.8 + (-5) / (-2 1/2) = -7.6