Question

1)0,56+(-0,81)=2)-14 25/11 - (-7 11/3)=3)-9,8+9 6/5=​

Answer 1

Ответ:

1).0,56+(-0,81)

-0,25-0,81

-1/4,-2минус два степени

2)-14×5/11-(-11/3)

-70/11+11/3

-89/33

- два целых 23/33,-2,69

Answer 2

Let's solve each of these arithmetic problems step by step:

1. $0.56 + (-0.81) = -0.25$

2. $-14 \frac{25}{11} - (-7 \frac{11}{3})$

To subtract fractions, we need a common denominator. The common denominator here is 33. So,

$-14 \frac{25}{11} - (-7 \frac{11}{3}) = -14 \cdot \frac{3}{3} \cdot \frac{25}{11} + 7 \cdot \frac{11}{11} \cdot \frac{3}{3} = -42 \frac{75}{33} + 7 \frac{33}{33} = -42 \frac{75}{33} + 7$

Now, let's simplify the fractions:

$-42 \frac{75}{33} + 7 = -42 \cdot \frac{25}{11} + 7 = -1050/11 + 7$

To add a whole number to a fraction, you need to express the whole number as a fraction with the same denominator:

$7 = \frac{77}{11}$

Now, add the fractions:

$-1050/11 + 77/11 = (-1050 + 77)/11 = -973/11$

So, the answer is $-973/11$.

3. $-9.8 + \frac{9}{6/5}$

First, simplify the fraction in the second term:

$\frac{9}{6/5} = 9 \cdot \frac{5}{6} = 15/2$

Now, add the two numbers:

$-9.8 + 15/2$

To add a decimal and a fraction, it's often easier to convert the decimal to a fraction with the same denominator:

$-9.8 = -9\frac{8}{10} = -9\frac{4}{5}$

Now, add the fractions:

$-9\frac{4}{5} + 15/2$

To add these fractions, you need a common denominator. The common denominator is 10, so:

$-9\frac{4}{5} + 15/2 = -9\frac{4}{5} \cdot \frac{2}{2} + \frac{15}{2} \cdot \frac{5}{5} = -18\frac{8}{10} + \frac{75}{10}$

Now, add the fractions:

$-18\frac{8}{10} + \frac{75}{10} = -18\frac{8+75}{10} = -18\frac{83}{10}$

So, the answer is $-18\frac{83}{10}$.