Question

(6,9 +2 11/20) х 2 3/5 - 3,5х2.7

Answer 1

(3 9/14+x)-2 5/14=6 7/14
3 9/14+x = 2 5/14+6 7/14
3 9/14+x = 8 12/14
x = 8 12/14 - 3 9/14
х= 5 3/14

Answer 2

Let's break down the expression step by step:

1. Calculate the addition inside the first set of parentheses: 6 + 9 = 15 2 11/20 is equal to 2.55 when converted to a decimal.

2. Calculate the multiplication inside the first set of parentheses: 15 * 2.55 = 38.25

3. Convert the mixed number 2 3/5 to an improper fraction: 2 3/5 = (2 * 5 + 3) / 5 = 13/5

4. Calculate the multiplication inside the second set of parentheses: 3.5 * 2.7 = 9.45

Now, we have two results:

• First result: 38.25
• Second result: 13/5 (or 2.6 when converted to a decimal)

Now, we'll multiply the two results together:

38.25 * 2.6 = 99.45

So, the final result of the expression is 99.45.