Question

А) (4/5-11/15)*5/11 б) 7/88*(8/21+3/7) в)3/7*(1/4+7/12)

Answer 1

Насчёт б) я не уверена

Answer 2

a)

First, we need to find the common denominator for 4/5 and 11/15, which is 15. Then we can rewrite the expression as:

((43)/(53) - (111)/(151)) * 5/11

Simplifying the fractions inside the parentheses, we get:

(12/15 - 11/15) * 5/11

Now we can subtract the fractions inside the parentheses:

1/15 * 5/11

Multiplying the fractions, we get:

5/165

Simplifying this fraction, we get:

1/33

Therefore, (4/5-11/15)*5/11 = 1/33.

b)

We can start by simplifying the expression inside the parentheses:

8/21 + 3/7 = (81)/(211) + (33)/(73) = 8/21 + 9/21 = 17/21

Now we can substitute this back into the original expression:

7/88 * 17/21

Multiplying the fractions, we get:

119/1848

Simplifying this fraction, we get:

5/308

Therefore, 7/88*(8/21+3/7) = 5/308.

c)

We can start by simplifying the expression inside the parentheses:

1/4 + 7/12 = (13)/(43) + (71)/(121) = 3/12 + 7/12 = 10/12

Simplifying this fraction, we get:

5/6

Now we can substitute this back into the original expression:

3/7 * 5/6

Multiplying the fractions, we get:

15/42

Simplifying this fraction, we get:

5/14

Therefore, 3/7*(1/4+7/12) = 5/14.