Which of the following equations containing grouping symbols is correct?

Question

A. (6 + 9) − 1 + (4 ÷ 1) = 12
B. 9 + (12 ÷ 4) = 1
C. 24 ÷ (8 + 4) + (16 ÷ 2) = 10
D. (3 − 1) − 2 − (8 − 5) = 12 − 9

Answer 1

A.

6 + 9 = 15

4 ÷ 1 = 4

( 6 + 9 ) − 1 + ( 4 ÷ 1 ) = 12

15 - 1 + 4 = 12

14 + 4 = 12

18 = 12 FALSE

B.

12 ÷ 4 = 3

9 + ( 12 ÷ 4 ) = 1

9 + 3 = 1

12 = 1 FALSE

C.

8 + 4 = 12

24 ÷ ( 8 + 4 ) = 24 ÷ 12 = 2

( 16 ÷ 2 ) = 8

24 ÷ ( 8 + 4 ) + ( 16 ÷ 2 ) = 10

2 + 8 = 10 Correct

D.

3 - 1 = 2

8 - 5 = 3

12 - 9 = 3

( 3 − 1 ) − 2 − ( 8 − 5 ) = 12 − 9

2 - 2 - 3 = 3

0 - 3 = 3

- 3 = 3 False

Ansver : C

Answer 2

HEHEHEH