Question

(5 9/10-7 4/5)-(2,8)=

Answer 1

Ответ -4,7
решение:
(59/10 - 39/5) - 14/5 = (-19/10)-14/5= -47/10

4 7/10

Answer 2

Let's break down the expression step by step:

1. Subtract the fractions: $5 \frac{9}{10} - 7 \frac{4}{5}$

   To subtract mixed numbers, you subtract the whole numbers separately and then the fractions separately.

   $5 - 7 = -2$ (for the whole numbers)

   To subtract the fractions, find a common denominator. The common denominator here is 10. So,

   $\frac{9}{10} - \frac{4}{5}$

   To make the denominators the same, multiply the first fraction by 1 in the form of $\frac{2}{2}$:

   $\frac{9}{10} - \frac{4}{5} \times \frac{2}{2} = \frac{9}{10} - \frac{8}{10}$

   Subtract the numerators:

   $\frac{1}{10}$

2. Subtract the result from step 1 from the number 2.8: $2.8 - (-2 \frac{1}{10})$

   To subtract a negative number, it's the same as adding its absolute value. So,

   $2.8 + 2 \frac{1}{10}$

   Add the whole numbers:

   $2 + 2 = 4$

   Add the fractions:

   $\frac{8}{10} + \frac{1}{10} = \frac{9}{10}$

   So, $4 \frac{9}{10}$ is the result of the expression $(5 \frac{9}{10} - 7 \frac{4}{5}) - (2.8)$.