Question

30 - 23,1:( 5 7/20 - 4 6/35)

Answer 1

1)57:20-46:35=1.54
2)30-23.1=6.9

Answer 2

3)57:20-46:35=1,54
2)30-23, 1=6,9
Вот и все.

Answer 3

Let's break down the expression step by step:

30 - 23.1: First, we subtract 23.1 from 30:

30 - 23.1 = 6.9

Now let's move on to the second part of the expression:

5 7/20 - 4 6/35: To subtract mixed numbers, we need to convert them to improper fractions.

5 7/20 = (5 * 20 + 7) / 20 = 107/20

4 6/35 = (4 * 35 + 6) / 35 = 146/35

Now, we can subtract the fractions:

107/20 - 146/35:

To subtract fractions, we need a common denominator, which in this case is 20 * 35 = 700.

(107/20) * (35/35) = 749/700

(146/35) * (20/20) = 2920/700

Now, subtract the fractions:

749/700 - 2920/700 = (749 - 2920) / 700 = -2171/700

Now we have both parts of the expression evaluated. Let's put them together:

6.9 - (-2171/700):

To subtract a negative fraction, we can rewrite it as addition:

6.9 + 2171/700:

To add a mixed number and a fraction, we need to convert the mixed number to an improper fraction.

6.9 = 6 + 0.9 = 6 + 9/10 = (6 * 10 + 9) / 10 = 69/10

Now we can add the fractions:

69/10 + 2171/700:

To add fractions, we need a common denominator, which in this case is 10 * 700 = 7000.

(69/10) * (700/700) = 4830/7000

(2171/700) * (10/10) = 21710/7000

Now, add the fractions:

4830/7000 + 21710/7000 = (4830 + 21710) / 7000 = 26540/7000

Finally, we can simplify the fraction by dividing the numerator and denominator by their greatest common divisor (GCD):

GCD(26540, 7000) = 20

26540/7000 = (26540/20) / (7000/20) = 1327/350

Therefore, the simplified result is 1327/350.