Question

2/7+(-15/28 По действиям и понятно пожалуйста

Answer 1

2/7-15/28=(8-15)/28=-7/28=-1/4

Answer 2

To add two fractions, we need to first find a common denominator.

In this case, the common denominator is the least common multiple of 7 and 28, which is 28.

We then need to adjust each fraction so that its denominator is 28.

For the first fraction, we can multiply the numerator and denominator by 4 to get:

2/7 = (2 x 4)/(7 x 4) = 8/28

For the second fraction, we can multiply the numerator and denominator by 2 to get:

-15/28 = (-15 x 2)/(28 x 2) = -30/56

Now that we have both fractions with a common denominator of 28, we can add them:

8/28 + (-30/56)

To simplify this expression, we need to first find a common numerator.

To do this, we can multiply the numerator and denominator of the first fraction by 2:

8/28 = (8 x 2)/(28 x 2) = 16/56

Now we can add the two fractions:

16/56 - 30/56 = -14/56

We can simplify this fraction by dividing the numerator and denominator by their greatest common factor, which is 14:

-14/56 = (-14/14) / (56/14) = -1/4

Therefore, 2/7 + (-15/28) = -1/4.