Question

1)2.5- 9\4 2)3:54 3)1\2*6\7 : 1 5\7 4) 34\3- 2.75:11

Answer 1

Ответ:смотри вкладку

Пошаговое объяснение:

Answer 2

Let's simplify each of the given expressions step by step:

1. 2.5 - 9/4 Step 1: Convert the whole number to a fraction: 2.5 = 2 + 0.5 = 2 + 1/2 = 2 + 2/4 Step 2: Find a common denominator for the fractions: 9/4 = 2.25 because 4 * 2 = 8, and 8 + 1 = 9 Step 3: Subtract the fractions: 2 + 2/4 - 2.25 = 2 + (2 - 2.25)/4 = 2 + (-0.25)/4 = 2 - 0.25/4 Step 4: Simplify the fraction: 2 - 1/4 = 1 3/4

So, 2.5 - 9/4 = 1 3/4.

2. 3:54 This expression seems to be a time format. The colon (:) usually separates hours and minutes. So, 3:54 means 3 hours and 54 minutes.

3. (1/2) * (6/7) : (1 5/7) Step 1: Convert the mixed number to an improper fraction: 1 5/7 = 7/7 + 5/7 = 1 + 5/7 = 12/7 Step 2: Perform the division: (1/2) * (6/7) ÷ (12/7) Step 3: Invert the divisor (12/7) and change the division to multiplication: (1/2) * (6/7) * (7/12) Step 4: Simplify the fractions: (1 * 6) / (2 * 12) = 6 / 24 Step 5: Reduce the fraction: 6/24 = 1/4

So, (1/2) * (6/7) : (1 5/7) = 1/4.

4. 34/3 - 2.75 : 11 Step 1: Find the decimal value of 2.75: 2.75 = 2 + 0.75 = 2 + 75/100 = 2 + 3/4 = 2 + 9/12 = 2 + 3/4 Step 2: Convert the whole number to a fraction: 34/3 = 10 + 4/3 Step 3: Perform the subtraction: 10 + 4/3 - 2 - 3/4 Step 4: Find a common denominator for the fractions: 4/3 = 16/12 Step 5: Perform the subtraction of the fractions: 10 + (4/3 - 3/4) = 10 + (16/12 - 9/12) = 10 + 7/12

So, 34/3 - 2.75 : 11 = 10 7/12.