Question

qual o resultado da expressão numérica (1/2-1/3) - (2/3) - (1/2)² A) 12/21 b) 4/3 C) 3/4 D) 15/12 E) -3/4

Answer 1

(1/2-1/3)-(2/3)-(1/2)^2=
(3.1/6-2.1/6)-(2/3)-(1/4)=
(3/6-2/6)-2/3-1/4=
1/6-2/3-1/4=
2.1/12-4.2/12-3.1/12=
2/12-8/12-3/12=
-6/12-3/12=
-9/12=
-3/4
Resposta: E