Question

5 1/4а-2 1/3а,если а=4/7

Answer 1

5/4а - 2/3а = 7/12а=7/ 48/7=49/48=1 1/48

Answer 2

To evaluate the expression 5 1/4а - 2 1/3а when а = 4/7, we need to substitute the value of а into the expression and then perform the arithmetic operations.

Given: а = 4/7

Let's first convert the mixed fractions into improper fractions: 5 1/4 = (5 * 4 + 1) / 4 = 21/4 2 1/3 = (2 * 3 + 1) / 3 = 7/3

Now, substitute the value of а:

5 1/4а - 2 1/3а = (21/4 * 4/7) - (7/3 * 4/7)

Now, perform the arithmetic operations:

= (21/4 * 4/7) - (7/3 * 4/7) = (21 * 4) / (4 * 7) - (7 * 4) / (3 * 7) = (84) / (28) - (28) / (21) = 3 - 4/3

To combine the fractions, find a common denominator, which is 3:

= (9/3) - (4/3) = 5/3

So, the value of 5 1/4а - 2 1/3а, when а = 4/7, is 5/3.