Question

X: 2/5+ 1 1/4 = 2 5/8

Answer 1

Пошаговое объяснение:

X: 2/5+ 1 1/4 = 2 5/8

X*5/2+ 1 1/4 = 2 5/8

2,5х=2 5/8-1 1/4

2,5х=2 5/8-1 2/8

2,5х=1 3/8

2,5х=1,375

х=0,55

Answer 2

Actually, the sum of 2/5 and 1 1/4 is not equal to 2 5/8. Let's perform the calculation step by step to determine the correct answer:

First, we need to convert the mixed number 1 1/4 to an improper fraction. To do that, we multiply the whole number (1) by the denominator (4) and add the numerator (1) to get the new numerator. So, 1 1/4 is equal to (1 * 4 + 1) / 4, which simplifies to 5/4.

Now, we can add the fractions:

2/5 + 5/4

To add fractions with different denominators, we need to find a common denominator. The least common multiple (LCM) of 5 and 4 is 20.

Converting the fractions to have a common denominator:

(2 * 4) / (5 * 4) + (5 * 5) / (4 * 5)

8/20 + 25/20

Now, we can add the numerators and keep the common denominator:

(8 + 25) / 20

33/20

The result is 33/20, which is an improper fraction. To express it as a mixed number, we can divide the numerator (33) by the denominator (20):

33 ÷ 20 = 1 with a remainder of 13

So, the mixed number is 1 13/20. Therefore, the correct sum is 1 13/20, not 2 5/8.