Răspuns :
2/21×5 1/4-3:6/11
2/21×21/4-3:6/11
1/2-3×11/6
1/2-11/2
(1-11)/2
-10/2
-5
Varianta corecta este b)-5
2 / 21 × 5 1 / 4 - 3 : 6 / 11 =
2 / 21 × ( 5 × 4 + 1 ) / 4 - 3 / 1 × 11 / 6 =
2 / 21 × ( 20 + 1 ) / 4 - 33 / 6 =
2 / 21 × 21 / 4 - 33 / 6 =
42 / 84 - 11 / 2 =
1 / 2 - 11 / 2 =
- 10 / 2 = - 5
Varianta corectă este b) - 5 .
