Question

Выполните действия: а) 2 3/5 - 4/5= b) 14 5/13 + 5 10/39=c) 4 - 7/10=d) 5/21 + 3/7= ​

Answer 1

Ответ:)

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а) 2 3/5 - 4/5=  13/5 - 4/5 = 9/5 = 1 4/5

b) 14 5/13⁽³ + 5 10/39=  14 15/39 + 5 10/39 = 19 25/39

c) 4 - 7/10=  3 10/10 - 7/10 = 3 3/10

d) 5/21 + 3/7⁽³= ​5/21 + 9/21 = 14/21 = 2/3

Answer 2

a) 2 3/5 - 4/5 =

To subtract mixed numbers, you'll first need to ensure they have the same denominator. In this case, the common denominator is 5.

2 3/5 - 4/5 = (2 + 3/5) - 4/5

Now, add the whole numbers first:

2 + 3/5 = 10/5 + 3/5 = 13/5

Now, subtract the fractions:

(13/5) - (4/5) = 9/5

So, the answer is 9/5.

b) 14 5/13 + 5 10/39 =

Again, make sure they have the same denominator. In this case, you can use the least common multiple of 13 and 39, which is 39.

14 5/13 + 5 10/39 = (14 + 5) + (5/13 + 10/39)

Add the whole numbers:

14 + 5 = 19

Now, add the fractions:

(5/13) + (10/39)

To add fractions with different denominators, you need to find a common denominator, which in this case is 39:

(5/13) * (3/3) = 15/39 (10/39)

Now, add the fractions:

(15/39) + (10/39) = 25/39

So, the answer is 19 25/39.

c) 4 - 7/10 =

Subtract the fraction from the whole number:

4 - 7/10 = 40/10 - 7/10 = (40 - 7)/10 = 33/10

So, the answer is 33/10.

d) 5/21 + 3/7 =

To add fractions, make sure they have the same denominator. In this case, the least common multiple of 21 and 7 is 21, so we'll use that as the common denominator:

(5/21) + (3/7) = (5/21) + (9/21)

Now, add the fractions:

(5/21) + (9/21) = 14/21

You can simplify this fraction by dividing both the numerator and denominator by their greatest common divisor, which is 7:

(14/7) / (21/7) = 2/3

So, the answer is 2/3.