Question

{[(2+a)×2+2]×2+2}×2+2=100÷2+2×2

Answer 1

{[(2+a)×2+2]×2+2}×2+2=100÷2+2×2
{[(2+a)×2+2]×2+2}×2+2=50+4
{[(2+a)×2+2]×2+2}×2=52
[(2+a)×2+2]×2+2=26
[(2+a)×2+2]×2=24
(2+a)×2+2=12
(2+a)×2=10
2+a=5
a=5-2=3

Answer 2

{[(2+a)x2+2]x2+2}X2+2=50+4=54
{[(2+a)x2+2]x2+2}x2=54-2=52
[(2+a)x2+2]x2+2=52:2=26
[(2+a)x2+2]x2=26-2=24
(2+a)x2+2=24:2=12
(2+a)x2=12-2=10
2+a=10:2=5
a=5-2=
3