Question

como resolver a expressão { [ ( 21 : 7 + 3 : 1 ) + ( 2 + 4 ) ] : ( 7 x 6 : 2 - 15 ) } x 3 = ?

Answer 1

{[(21 ÷ 7 + 3 ÷ 1) + (2 + 4)] ÷ (2 × 6 ÷ 2 - 15)} × 3

{[(3 + 3) + 6] ÷ (1 × 6 - 15)} × 3

{[6 + 6] ÷ (6 - 15)} × 3

{12 ÷ (-9)} × 3

- 12/9 × 3

- 4/3 × 3

-4