Question

(0,8 - 2/3) * 2 1/2 + 2

Answer 1

0,8 = 8/10 = 4/5 - сократили на 2
2 целых 1/2 =  (2*2+1)/2 = 5/2
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(0,8 - 2/3) * 2 1/2 + 2 = 2 1/3
1) 0,8 - 2/3 = 4/5 - 2/3 = 12/15 - 10/15 = 2/15
2) 2/15 * 2 1/2 = 2/15 * 5/2 = 5/15 = 1/3 
3) 1/3 + 2 = 2 целых 1/3

Answer 2

To simplify the expression, let's perform the operations step by step:

First, let's simplify the multiplication:

(0,8 - 2/3) * 2 1/2

Converting the mixed number to an improper fraction:

2 1/2 = (2 * 2 + 1) / 2 = 5/2

Now we can rewrite the expression:

(0.8 - 2/3) * (5/2)

Next, let's subtract 2/3 from 0.8:

0.8 - 2/3 = (0.8 * 3 - 2) / 3 = (2.4 - 2) / 3 = 0.4 / 3 = 4/30

Now we have:

(4/30) * (5/2)

To multiply fractions, we multiply the numerators and denominators:

(4/30) * (5/2) = (4 * 5) / (30 * 2) = 20/60

Now let's simplify 20/60 by dividing both the numerator and denominator by their greatest common divisor, which is 20:

20/60 = (20/20) / (60/20) = 1/3

Finally, we add 2 to 1/3:

1/3 + 2 = (1/3 * 3 + 2 * 3) / 3 = (3/3 + 6/3) / 3 = 9/3 / 3 = 3/1 = 3

Therefore, the expression (0,8 - 2/3) * 2 1/2 + 2 is equal to 3.