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2+2×{2+2×[2+2×(2-2:a)]}=22
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Răspuns :

2+2×{2+2×[2+2×(2-2:a)]}=22
Scădem 2

2+2×{2+2×[2+2×(2-2:a)]} - 2=22-2
2 - 2+2×{2+2×[2+2×(2-2:a)]}=20
2×{2+2×[2+2×(2-2:a)]}=20
Împărțim la 2

{2×{2+2×[2+2×(2-2:a)]} }:2=20:2
(2:2)×{2+2×[2+2×(2-2:a)]}=20:2
2+2×[2+2×(2-2:a)] = 10
Scădem 2

2+2×[2+2×(2-2:a)]-2 = 10-2
2-2+2×[2+2×(2-2:a)] = 8
2×[2+2×(2-2:a)] = 8
Împărțim la 2

{2×[2+2×(2-2:a)]}:2 = 8:2
(2:2)×[2+2×(2-2:a)] = 4
2+2×(2-2:a) = 4
Scădem 2

2+2×(2-2:a)-2 = 4-2
2-2+2×(2-2:a)-2 = 2
2×(2-2:a) = 2
Împărțim la 2

[2×(2-2:a)]:2 = 2:2
(2:2)×(2-2:a) = 1
1×(2-2:a) = 1
2-2:a = 1
Adunăm 2:a

2 - 2:a + 2:a = 1 + 2:a
2 = 1 + 2:a
Scădem 1

1 = 2:a
=> a = 2
2+2×{2+2×[2+2×(2-2:a)]}=22 folosim metoda mersului invers
2×{2+2×[2+2×(2-2:a)]}=22-2
2×{2+2×[2+2×(2-2:a)]}=20
2+2×[2+2×(2-2:a)]=20:2
2+2×[2+2×(2-2:a)]=10
2×[2+2×(2-2:a)]=10-2
2×[2+2×(2-2:a)]=8
2+2×(2-2:a)=8:2
2+2×(2-2:a)=4
2×(2-2:a)=4-2
2×(2-2:a)=2
2-2:a=2:2
2-2:a=1
2:a=2-1
2:a=1
a=2:1
a=2(impartitor)