Question

5/2:4/5-1,8 решение и ответ

Answer 1

5/2*5/4-1,8= 25/8 -1,8= 3,125-1,8= 1,325

Answer 2

To solve the expression 5/2 - 4/5 - 1.8, follow these steps:

Step 1: Convert the whole numbers to fractions: 1.8 can be written as 1 8/10, which simplifies to 1 4/5 as a fraction.

Step 2: Find a common denominator for the fractions involved, which is 10.

Step 3: Rewrite the fractions using the common denominator: 5/2 = 25/10 (multiply numerator and denominator by 5) 4/5 = 8/10 (multiply numerator and denominator by 2)

Now, the expression becomes: 25/10 - 8/10 - 1 4/5

Step 4: Combine the fractions and the whole number: 25/10 - 8/10 - 1 4/5 = (25 - 8)/10 - 1 4/5 = 17/10 - 1 4/5

Step 5: Convert 1 4/5 to an improper fraction: 1 4/5 = (5*1 + 4)/5 = 9/5

Now, the expression becomes: 17/10 - 9/5

Step 6: Find a common denominator, which is 10: 17/10 = 17/10 9/5 = (9*2)/10 = 18/10

Now, the expression becomes: 17/10 - 18/10

Step 7: Perform the subtraction: 17/10 - 18/10 = (17 - 18)/10 = -1/10

So, the final answer is -1/10.