Question

(0,3-3/20)*2 2/9-2/5:1,4 Решите

Answer 1

$( \frac{3}{10} - \frac{3}{20} ) \times 2 \frac{2}{9} - \frac{2}{5} \div \frac{14}{10} = \frac{3}{10} \times \frac{20}{9} - \frac{4}{10} \times \frac{10}{14} = \frac{2}{3} - \frac{2}{7} = \frac{14 - 6}{21} = \frac{8}{21}$

Answer 2

To solve the expression, let's break it down step by step:

1. Evaluate the expression inside the parentheses: (0,3 - 3/20) * 2 Subtract 3/20 from 0.3: 0.3 - 3/20 = (6/20) - (3/20) = 3/20

   Now multiply by 2: 3/20 * 2 = 6/20 = 3/10

2. Evaluate the expression after the multiplication: 2/9 - 2/5 : 1,4

   Note: There seems to be a comma in the expression, which is a bit unusual. It's possible that the comma represents a decimal separator. If that's the case, the expression should be interpreted as:

   2/9 - 2/5 ÷ 1.4

   To proceed, let's convert 1.4 to a fraction: 1.4 = 14/10

   Now, we can rewrite the expression as: 2/9 - 2/5 ÷ 14/10

   To divide by a fraction, we multiply by its reciprocal: 2/9 - 2/5 * 10/14

   Now, find a common denominator, which is 90: 2/9 = 20/90 2/5 * 10/14 = 20/70 = 18/90 (after simplification)

   Now, subtract the fractions: 20/90 - 18/90 = 2/90 = 1/45

So, the final result is: 3/10 - 1/45

To subtract these fractions, find a common denominator, which is 90: (3/10) * (9/9) = 27/90 (1/45) * (2/2) = 2/90

Now, subtract the fractions: 27/90 - 2/90 = 25/90

The simplified result is 25/90, which can be further reduced to 5/18.

Therefore, the solution to the expression is 5/18.