Question

2+2×[2+2×(2+2×a:2)]=26

Answer 1

[] ×2=26-2

[]=24:2

2+2×()=12

2×()=12-2

()=10:2

2+2a:2=5

2a:2=3

2a=3×2

a=6:2

a=3

Answer 2

Răspuns: a = 3

Explicație pas cu pas:

2 + 2 × [ 2 + 2 × ( 2 + 2 × a : 2 ) ] = 26

2 × [ 2 + 2 × ( 2 + 2 × a : 2 ) ] = 26 - 2

2 × [ 2 + 2 × ( 2 + 2 × a : 2 ) ] = 24

2 + 2 × ( 2 + 2 × a : 2 ) = 24 : 2

2 + 2 × ( 2 + 2 × a : 2 ) = 12

2 × ( 2 + 2 × a : 2 ) = 12 - 2

2 + 2 × a : 2 = 10 : 2

2 × a : 2 = 5 - 2

2 × a : 2 = 3

2 × a = 3 × 2

2 × a = 6

a = 6 : 2

a = 3 → numarul, aflat prin metoda mersului invers