Question

Срочно!!!!Обчислити: 1) - 43 + (- 60) + 18 + 36 + (- 19) 2) - 2.43 + 6, 31 + (- 3, 21) + 0, 49 + 4, 87 - 2 3/7 + 8 9/14 + (- 5 5/21) 3) 2/3 + (- 7/8) + 5/6 + (- 7/12)

Answer 1

Ответ: 1. 43 + (- 60) + 18 + 36 + (- 19) = - 60 + 18 + 36 - 43 - 19 = - 60 + 36 - 43 - 19 = - 60 + (- 7) - 19 = -60 - 26 = - 86

2. 2.43 + 6,31 + (- 3,21) + 0,49 + 4,87 = - 2.43 + 6.31 - 3.21 + 0.49 + 4.87 = - 2.43 + 6.31 + 0.49 + 4.87 - 3.21 = 5.17

2 3/7 + 8 9/14 + (- 5 5/21) = - 2 3/7 + 8 9/14 - 5 5/21 = 8 14/14 + (- 2 22/42) = 8 + (- 2) = 6

3. 2/3 + (- 7/8) + 5/6 + (- 7/12) = 2/3 - 7/8 + 5/6 - 7/12 = (12/12 + 10/12 - 7/12) /12 = 15/12 - 7/12 = 8/12 = 2/3

Answer 2

1. -43 + (-60) + 18 + 36 + (-19) = -43 - 60 + 18 + 36 - 19 = -48.

2. -2.43 + 6.31 + (-3.21) + 0.49 + 4.87 - 2 = 6.31 - 2.43 - 3.21 + 0.49 + 4.87 - 2 = 6.31 + 0.49 + 4.87 - 2.43 - 3.21 - 2 = 6.31 + 0.49 + 4.87 - 5.64 - 2 = 6.8 - 5.64 - 2 = -1.84.

3. To add fractions with different denominators, we need to find a common denominator.

The common denominator for 2/3, -7/8, 5/6, and -7/12 is 24.

2/3 = (2/3) * (8/8) = 16/24. -7/8 = (-7/8) * (3/3) = -21/24. 5/6 = (5/6) * (4/4) = 20/24. -7/12 = (-7/12) * (2/2) = -14/24.

Now we can add the fractions:

2/3 + (-7/8) + 5/6 + (-7/12) = 16/24 + (-21/24) + 20/24 + (-14/24) = (16 - 21 + 20 - 14)/24 = 1/24.

Therefore, 2/3 + (-7/8) + 5/6 + (-7/12) = 1/24.