Question

8,9+(-15); 1/3+1/2;1 5/9+(-3); 7,6×(-0,5); 0,64:(-0,16);(-4/9)×(-3/4); 7/12:(-1/4); 7/25×(-5);(-8/15):(-1 1/5)​

Answer 1

Не знаю насколько правильно

Answer 2

Ответ:

если будуть питання задавай

Answer 3

Let's calculate the expressions step by step:

1. 8.9 + (-15): This is a simple addition. Adding a negative number is the same as subtracting. So, 8.9 + (-15) = 8.9 - 15 = -6.1.

2. 1/3 + 1/2: To add fractions, we need a common denominator. The least common multiple of 3 and 2 is 6. So, we'll convert both fractions to have a denominator of 6. 1/3 becomes 2/6, and 1/2 becomes 3/6. Now we can add them: 2/6 + 3/6 = 5/6.

3. 1 5/9 + (-3): Mixed numbers can be converted to improper fractions before performing calculations. 1 5/9 can be converted to (9 + 5)/9 = 14/9. Now, 14/9 + (-3) = 14/9 - 3 = (14 - 27)/9 = -13/9.

4. 7.6 × (-0.5): This is a simple multiplication. Multiplying a number by a negative number gives a negative result. 7.6 × (-0.5) = -3.8.

5. 0.64 ÷ (-0.16): Division by a negative number is the same as multiplying by its reciprocal. So, we have: 0.64 ÷ (-0.16) = 0.64 × (-1/0.16) = 0.64 × (-6.25) = -4.

6. (-4/9) × (-3/4): When multiplying two negative fractions, the result is positive. (-4/9) × (-3/4) = (4/9) × (3/4) = 12/36 = 1/3.

7. 7/12 ÷ (-1/4): Division by a negative number is the same as multiplying by its reciprocal. 7/12 ÷ (-1/4) = 7/12 × (-4/1) = -28/12 = -7/3.

8. 7/25 × (-5): Multiplying a fraction by a negative number gives a negative result. 7/25 × (-5) = -35/25 = -7/5.

9. (-8/15) ÷ (-1 1/5): Mixed numbers can be converted to improper fractions. -1 1/5 can be converted to (-5 + 1)/5 = -4/5. (-8/15) ÷ (-4/5) = (-8/15) × (-5/4) = 40/60 = 2/3.

So, the results of the given expressions are:

1. 8.9 + (-15) = -6.1
2. 1/3 + 1/2 = 5/6
3. 1 5/9 + (-3) = -13/9
4. 7.6 × (-0.5) = -3.8
5. 0.64 ÷ (-0.16) = -4
6. (-4/9) × (-3/4) = 1/3
7. 7/12 ÷ (-1/4) = -7/3
8. 7/25 × (-5) = -7/5
9. (-8/15) ÷ (-1 1/5) = 2/3