Question

rezultatul calculului 2/21•5 1/4-3:6/11 este: a) 3/21 b) -5 c)1 d)2/11
vreau rezolvare completă!!!
dau coroana​

Answer 1

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

Answer 2

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 .