Question

0,8+0,2:(7/15-1целая 1/12 + 9/20)

Answer 1

сначала действия в скобках (приводим к общему знаменателю)

Answer 2

To solve the expression, let's follow the order of operations (PEMDAS/BODMAS):

1. Simplify the fraction inside the parentheses.
2. Perform the division inside the parentheses.
3. Perform the addition and subtraction inside the parentheses.
4. Perform the division outside the parentheses.
5. Perform the addition.

Step 1: Simplify the fraction inside the parentheses (the mixed number): 1 целая 1/12 is the same as (1 * 12 + 1)/12 = 13/12.

Step 2: Perform the division inside the parentheses: 7/15 - 13/12 + 9/20

To perform the subtraction of fractions, they need a common denominator. The least common multiple (LCM) of 12, 15, and 20 is 60.

Step 3: Convert the fractions to have a common denominator of 60: (7/15) * (4/4) = 28/60 (13/12) * (5/5) = 65/60 (9/20) * (3/3) = 27/60

Step 4: Perform the addition and subtraction inside the parentheses: 28/60 - 65/60 + 27/60 = (28 - 65 + 27)/60 = -10/60 = -1/6

Step 5: Perform the division outside the parentheses: 0,2 / (-1/6) = 0.2 * (-6/1) = -1.2

Finally, perform the addition: 0,8 + (-1.2) = -0.4

So, the result of the expression is -0.4.