Question

-9 10/21+(-3 5/21) СРОЧНО!!!!!!!!!!!!!!!!!!!!!!!!!!!

Answer 1

Ответ:

-12 5/7 вот можно лючшую отметку

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Пошаговое объяснение:

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Answer 2

Ответ:-12 5/7

Пошаговое объяснение:

Answer 3

To add the two mixed numbers (-9 10/21) and (-3 5/21), you can follow these steps:

Step 1: Add the whole numbers: -9 + (-3) = -12

Step 2: Add the fractions: 10/21 + 5/21 = 15/21

Step 3: Simplify the fraction if possible: 15/21 can be simplified by dividing both the numerator and denominator by their greatest common divisor, which is 3: (15 ÷ 3) / (21 ÷ 3) = 5/7

So, the sum of -9 10/21 and -3 5/21 is:

-12 + 5/7

Now, you have a mixed number and a fraction. To combine them, you can convert -12 to a fraction with the same denominator as 7:

-12 = -84/7

Now, add the fractions:

-84/7 + 5/7 = -79/7

So, the result is:

-79/7

You can also express this as a mixed number:

-79/7 = -11 6/7

Therefore, the sum of -9 10/21 and -3 5/21 is either -79/7 or -11 6/7.