Question

1) 4,2 + (-7,8) 2) -8,6 + 11,3 3)-3 7/10 + (-1 4/15) 4)6,8 - (5,4) 5)4,6 - 9,4 7) -7,6 - (-8) 8) -11/15 - 7/20

Answer 1

напишу только ответи

1)-3.6

2)2.7

3)-4.63

4)1.4

5)-4.8

7)-15.6

8)-1.083

Answer 2

To solve these expressions, I'll perform the arithmetic calculations step by step:

1. 4.2 + (-7.8) = 4.2 - 7.8 (Subtracting a negative is the same as adding its positive) = -3.6

2. -8.6 + 11.3 = 11.3 - 8.6 (Subtracting a negative is the same as adding its positive) = 2.7

3. -3 7/10 + (-1 4/15) To perform this addition, we need to find a common denominator for 10 and 15, which is 30. = -37/10 + (-14/15) (Convert the mixed numbers to improper fractions) = -111/30 + (-28/30) (Now both fractions have a common denominator) = -139/30

4. 6.8 - 5.4 = 1.4

5. 4.6 - 9.4 = -4.8

6. -7.6 - (-8) To subtract a negative, we can change it to addition with the positive value. = -7.6 + 8 = 0.4

7. -11/15 - 7/20 To perform this subtraction, we need to find a common denominator for 15 and 20, which is 60. = -44/60 - 21/60 (Convert both fractions to have a common denominator) = -65/60 (Combine the fractions) = -13/12

So, the results are:

1. 4.2 + (-7.8) = -3.6
2. -8.6 + 11.3 = 2.7
3. -3 7/10 + (-1 4/15) = -139/30
4. 6.8 - 5.4 = 1.4
5. 4.6 - 9.4 = -4.8
6. -7.6 - (-8) = 0.4
7. -11/15 - 7/20 = -13/12