Question

А)-1,7-(-8)= б)5/9-2= в)-7 7/24 - 4 13/16= г)-3 3/14-(-2 5/6)=

Answer 1

Ответ:

Пошаговое объяснение:

а. 6.3

б.-13/9

в.-127/24

г.43/42

Answer 2

а) -1,7 - (-8) means subtracting a negative number from a negative number. When subtracting a negative number, it's the same as adding a positive number. So, in this case, -1,7 - (-8) becomes -1,7 + 8.

Now, to add -1,7 and 8, we align the decimal point and add the numbers:

-1,7 + 8,0 ------- 6,3

Therefore, -1,7 - (-8) = 6,3.

b) 5/9 - 2 means subtracting 2 from 5/9.

To subtract fractions, we need to have the same denominator. In this case, the denominator is already the same. So, we can subtract the numerators:

5/9 - 2 = 5/9 - 18/9 = (5 - 18)/9 = -13/9.

Therefore, 5/9 - 2 = -13/9.

c) -7 + 7/24 - 4 + 13/16 means adding and subtracting mixed numbers and fractions.

First, let's combine the whole numbers:

-7 - 4 = -11.

Now let's combine the fractions:

7/24 + 13/16.

To add fractions, we need to have the same denominator. Let's find a common denominator:

The least common multiple of 24 and 16 is 48.

Now, let's convert 7/24 and 13/16 to have the same denominator of 48:

7/24 = (7 * 2)/(24 * 2) = 14/48.

13/16 = (13 * 3)/(16 * 3) = 39/48.

Now we can add the fractions:

14/48 + 39/48 = 53/48.

Now let's combine the whole number and the fraction:

-11 + 53/48.

To combine the whole number and the fraction, we need to have the same denominator. Let's convert -11 to have the same denominator of 48:

-11 = (-11 * 48)/48 = -528/48.

Now we can add the whole number and the fraction:

-528/48 + 53/48 = (-528 + 53)/48 = -475/48.

Therefore, -7 + 7/24 - 4 + 13/16 = -475/48.

d) -3 + 3/14 - (-2 + 5/6) means subtracting mixed numbers and fractions.

First, let's simplify -(-2 + 5/6):

-(-2 + 5/6) = -(-2) - 5/6 = 2 - 5/6.

Now let's combine the whole numbers:

-3 + 2 = -1.

Now, let's combine the fractions:

5/6.

Therefore, -3 + 3/14 - (-2 + 5/6) = -1 + 3/14 - 5/6.