Question

34 БАЛЛА 7/20 - (3-2 39/40) : 5/4 - 1 1/5

Answer 1

Ответ:

Пошаговое объяснение:

Answer 2

To solve the expression, let's break it down step by step:

1. 7/20 - (3 - 2 39/40)
2. 5/4 - 1 1/5

Step 1: To simplify the expression within the parentheses, subtract 2 39/40 from 3: 3 - 2 39/40 = 3 - (2 + 39/40) = 3 - (79/40)

Now, we have: 7/20 - (3 - 2 39/40) = 7/20 - (3 - 79/40)

To perform the subtraction in the parentheses, we need a common denominator, which is 40: 7/20 - (3 - 79/40) = 7/20 - (120/40 - 79/40) = 7/20 - 41/40

Now, we have a common denominator, so we can perform the subtraction: 7/20 - 41/40 = (7/20 * 2/2) - 41/40 = 14/40 - 41/40 = -27/40

Step 2: Now, let's simplify the second expression: 5/4 - 1 1/5 = 5/4 - (1 + 1/5) = 5/4 - (5/5 + 1/5) = 5/4 - 6/5

To subtract fractions, we need a common denominator, which is 20: 5/4 - 6/5 = (5/4 * 5/5) - (6/5 * 4/4) = 25/20 - 24/20 = 1/20

So, the final result is: -27/40 - 1/20 = -27/40 - 2/40 = -29/40

The result of the expression is -29/40 or -0.725 in decimal form.