Question

{126-4x[3600:60-7x(54:9)+3]}:7+3xa=27:3

Answer 1

Răspuns:

{126-4×[3600:60-7×(54:9)+3]}:7+3×a=27:3

[126-4×(3600:60-7×6+3)]:7+3×a=9

[126-4×(60-42+3)]:7+3×a=9

[126-4×(18+3)]:7+3×a=9

(126-4×21):7+3×a=9

(126-84):7+3×a=9

42:7+3×a=9

6+3×a=9

3×a=9-6

3×a=3

a=3:3

a=1

Answer 2

Răspuns:

{126-4x[3600:60-7x(54:9)+3]}:7+3a=27:3

[126-4(60-7·6+3)]:7+3a=9

[126-4(60-42+3)]:7+3a=9

(126-4·21):7+3a=9

(126-84):7+3a=9

42:7+3a=9

6+3a=9

3a=9-6

a=3:3

a=1