Question

Решите пожалуйста два примера умоляю срочно 1) -8-(-12)-(-7)+12-20=? 2)2целых 3/4-(- 1целая 1/2)+(-3 целых 5/6)=?

Answer 1

Ответ:

Пошаговое объяснение:

1) -8-(-12)-(-7)+12-20= -8 + 12 + 7 + 12 - 20 = -28 + 31 = 3

2)2целых 3/4-(- 1целая 1/2)+(-3 целых 5/6)= 2 3/4 + 1 1/2 - 3 5/6 = 2 9/12 + 1 6/12 - 3 10/12 = 3 15/12 - 3 10/12 = 5/12

Answer 2

Ответ:

1) -8-(-12)-(-7)+12-20 с начала открываем скобки

-8+12+7+12-20=3

Answer 3

1. -8-(-12)-(-7)+12-20 = -8 + 12 + 7 + 12 - 20

Simplifying each term inside the parentheses:

= -8 + 12 + 7 + 12 - 20 = 4 + 7 + 12 - 20 = 11 + 12 - 20 = 23 - 20 = 3

Therefore, -8-(-12)-(-7)+12-20 equals 3.

2. 2 целых 3/4 - (-1 целая 1/2) + (-3 целых 5/6)

First, let's convert the mixed numbers to improper fractions:

2 целых 3/4 = 2 + 3/4 = 8/4 + 3/4 = 11/4 -1 целая 1/2 = -1 - 1/2 = -2/1 - 1/2 = -4/2 - 1/2 = -5/2 -3 целых 5/6 = -3 - 5/6 = -18/6 - 5/6 = -23/6

Now we can substitute the values:

11/4 - (-5/2) + (-23/6)

When subtracting a negative number, we can rewrite it as addition:

11/4 + 5/2 + (-23/6)

Now we need to find a common denominator, which is 12:

11/4 + 15/4 + (-46/12)

Combine the numerators:

(11 + 15 - 46)/12

Simplify the numerator:

(-20)/12 = -5/3

Therefore, 2 целых 3/4 - (-1 целая 1/2) + (-3 целых 5/6) equals -5/3.