Question

1. -2 4/5*2 1/7 2. спростить вираз -13+0,5у+25х-30упожалйста

Answer 1

Відповідь:

1) -2 4/5*2 1/7 = 6

2) = -13 - 29.5 у + 25

Answer 2

1. To simplify the expression -2 4/5 * 2 1/7, we need to convert the mixed numbers into improper fractions first.

-2 4/5 can be written as (-2 * 5 + 4) / 5 = (-10 + 4) / 5 = -6/5.

2 1/7 can be written as (2 * 7 + 1) / 7 = (14 + 1) / 7 = 15/7.

Now we can simplify the expression:

-6/5 * 15/7 = (-6 * 15) / (5 * 7) = -90/35.

To further simplify the fraction, we can divide both the numerator and denominator by their greatest common divisor (GCD), which is 5:

-90/35 = (-18 * 5) / (7 * 5) = -18/7.

Therefore, the simplified expression is -18/7.

2. To simplify the expression -13 + 0.5y + 25x - 30, we combine like terms:

-13 + 0.5y + 25x - 30 = (-13 - 30) + 0.5y + 25x = -43 + 0.5y + 25x.

So the simplified expression is -43 + 0.5y + 25x.