Question

A-(9 3/50-5 7/25) при a =7 /12

Answer 1

$a-(9\frac{3}{50}-5 \frac{7}{25}); \\ \frac{20*7}{300} -(\frac{453*6}{300}-\frac{132*12}{300})= \frac{140}{300}-( \frac{2718}{300}-\frac{1584}{300})= \\ =\frac{140}{300}-( \frac{1134}{300})= -\frac{994}{300}=-3 \frac{94}{300}=-3 \frac{47}{150}$

Answer 2

To evaluate the expression A - (9 3/50 - 5 7/25) when a = 7/12, we need to perform the subtraction and substitute the value of a into the expression. Let's break it down step by step.

First, let's convert the mixed numbers into improper fractions:

9 3/50 = (9 * 50 + 3) / 50 = 453/50 5 7/25 = (5 * 25 + 7) / 25 = 132/25

Next, substitute the value of a = 7/12 into the expression:

A - (9 3/50 - 5 7/25) = A - (453/50 - 132/25)

Now, let's find a common denominator for the fractions:

Common denominator = 50 * 25 = 1250

Rewrite the fractions with the common denominator:

A - (453/50 - 132/25) = A - (453/50 * 25/25 - 132/25 * 50/50) = A - (22650/1250 - 6600/1250)

Perform the subtraction:

A - (22650/1250 - 6600/1250) = A - (16050/1250)

Simplify the expression further:

A - 16050/1250

Now, substitute the value of a = 7/12:

A - 16050/1250 = 7/12 - 16050/1250

To perform the subtraction of fractions, we need a common denominator. The common denominator is 12 * 1250 = 15000.

Rewrite the fractions with the common denominator:

(7/12) * (1250/1250) - (16050/1250) = 8750/15000 - 16050/15000

Perform the subtraction:

8750/15000 - 16050/15000 = -7300/15000

The result is -7300/15000.