Question

-1 7/8 + 9-7 5/9) = -5,15 + (-2 1/4) =

Answer 1

Ответ:

-1 7/8 + 9-7 5/9) = -0,43

-5,15 + (-2 1/4) = -7,4

Пошаговое объяснение:

1) -1 7/8 + 9-7 5/9)

-15/8+9-68/9

-31/72

-0,43

2) -5,15 + (-2 1/4)

-103/20-2 1/4

-103/20-9/4

-37/5

-7,4

Answer 2

Let's break down the calculations step by step:

1. First, add the mixed numbers within the parentheses:

   -1 7/8 + (9 - 7 5/9)

   To add -1 7/8 to 9, you can convert -1 to an improper fraction and add:

   -1 = -8/8, so -1 7/8 = (-8/8) + (7/8) = -15/8 + 7/8 = -8/8 = -1

   Now, let's subtract 7 5/9 from it. To subtract mixed numbers, we'll first convert them to improper fractions:

   7 5/9 = (9 * 7) + 5 / 9 = 63/9 + 5/9 = 68/9

   Now, subtract 68/9 from -1:

   -1 - 68/9 = -9/9 - 68/9 = (-9 - 68)/9 = -77/9

2. Now, add this result to the next number:

   -5.15 + (-2 1/4)

   Again, convert the mixed number to an improper fraction:

   -2 1/4 = (-8/4) + (1/4) = -7/4

   Now, add -7/4 to -77/9:

   -7/4 - 77/9

   To add these fractions, you'll need to find a common denominator. The common denominator is the least common multiple of 4 and 9, which is 36. So, you'll need to rewrite these fractions with a common denominator of 36:

   -7/4 * 9/9 = -63/36 -77/9 * 4/4 = -308/36

   Now, add the fractions with a common denominator:

   (-63/36) + (-308/36) = (-63 - 308) / 36 = -371/36

So, the final result is -371/36.