Question

-9/20×(-18/25) решите п лс28/63÷(-9/7)

Answer 1

1) -9/20 • -18/25 = 81/250 или 0,324
2) 28/63 = 4/9
4/9 : (-9/7) = - 28/81

Answer 2

$- \frac{9}{20} \times ( - \frac{18}{25} ) = \frac{9 \times 18}{20 \times 25} = \\ \frac{9 \times 9}{10 \times 25} = \frac{81}{250}$
$\frac{28}{63} \div ( - \frac{9}{7} ) = - \frac{28 \times 7}{63 \times 9} = \\ - \frac{28}{9 \times 9} = - \frac{28}{81}$

Answer 3

To solve the expressions, follow the order of operations (PEMDAS/BODMAS: Parentheses/Brackets, Exponents/Orders, Multiplication and Division, Addition, and Subtraction).

1. -9/20 × (-18/25): To multiply fractions, simply multiply the numerators and denominators separately. (-9/20) × (-18/25) = (9 * 18) / (20 * 25) = 162 / 500

2. 28/63 ÷ (-9/7): To divide fractions, invert the second fraction and then multiply them. (28/63) ÷ (-9/7) = (28/63) × (-7/9) = (28 * -7) / (63 * 9) = -196 / 567

Therefore, the solutions are:

1. -9/20 × (-18/25) = 162/500
2. 28/63 ÷ (-9/7) = -196/567