Question

(2-5+7-1)²:(-3)²-21​

Answer 1

(2 - 5 + 7 - 1)^2 : (-3)^2 - 21 = 9 : 9 - 21 = 1 - 21 = -20

Ответ: -20.

Answer 2

Ответ:

$(2-5+7-1)^2:(-3)^2-21=(3)^:(-3)^2-21=9:9-21=1-21=-20$

Answer 3

Let's solve this expression step by step:

1. Evaluate the expression within the parentheses: (2 - 5 + 7 - 1)² = 3² = 9.

2. Evaluate the expression within the second set of parentheses: (-3)² = 9.

3. Subtract the value within the second set of parentheses from the value obtained in step 1: 9 - 9 = 0.

4. Finally, divide the result from step 3 by -21: 0 / -21 = 0.

So, the final result of the expression (2 - 5 + 7 - 1)² : (-3)² - 21 is 0.