Question

6,56-(5,56-7,5)-(4,2-7,89)=? -(5,23-2,5)-(-4,23+10)=?-(7 4/7-10 1/3)-(-8 4/7+3 1/3)=?​

Answer 1

Ответ:

Последнее записано непонятно

Answer 2

Let's solve these mathematical expressions step by step:

1. $6.56 - (5.56 - 7.5) - (4.2 - 7.89)$:

   First, solve the innermost parentheses:

   $5.56 - 7.5 = -1.94$

   $4.2 - 7.89 = -3.69$

   Now, substitute these values back into the expression:

   $6.56 - (-1.94) - (-3.69)$

   When you subtract a negative number, it becomes addition:

   $6.56 + 1.94 + 3.69$

   Now, add the numbers:

   $6.56 + 1.94 + 3.69 = 12.19$

   So, the result is $12.19$.

2. $-(5.23 - 2.5) - (-4.23 + 10)$:

   Solve the innermost parentheses:

   $5.23 - 2.5 = 2.73$

   $-4.23 + 10 = 5.77$

   Now, substitute these values back into the expression:

   $-2.73 - 5.77$

   Subtract the numbers:

   $-2.73 - 5.77 = -8.5$

   So, the result is $-8.5$.

3. $-(7 \frac{4}{7} - 10 \frac{1}{3}) - (-8 \frac{4}{7} + 3 \frac{1}{3})$:

   First, convert the mixed fractions to improper fractions:

   $7 \frac{4}{7} = \frac{51}{7}$

   $10 \frac{1}{3} = \frac{31}{3}$

   $8 \frac{4}{7} = \frac{60}{7}$

   $3 \frac{1}{3} = \frac{10}{3}$

   Now, substitute these values back into the expression:

   $-\left(\frac{51}{7} - \frac{31}{3}\right) - \left(-\frac{60}{7} + \frac{10}{3}\right)$

   Now, calculate the expressions inside the parentheses:

   $-\left(\frac{51}{7} - \frac{31}{3}\right) = -\left(\frac{153}{21} - \frac{217}{21}\right) = -\frac{153 - 217}{21} = -\frac{-64}{21} = \frac{64}{21}$

   $-\left(-\frac{60}{7} + \frac{10}{3}\right) = -\left(-\frac{180}{21} + \frac{70}{21}\right) = -\frac{180 - 70}{21} = -\frac{110}{21}$

   Now, subtract the two results:

   $\frac{64}{21} - \frac{110}{21} = \frac{64 - 110}{21} = \frac{-46}{21}$

   So, the result is $\frac{-46}{21}$.

Here are the results for each expression:

1. $6.56 - (5.56 - 7.5) - (4.2 - 7.89) = 12.19$
2. $-(5.23 - 2.5) - (-4.23 + 10) = -8.5$