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11÷1-(3×3)+11+7-7+7 Ma ajuta cineva???!

Răspuns :

11÷1-(3×3)+11+7-7+7=
=11÷1-9+11+7-7+7
=11-9+11+7-7+7
=20

Succes !
11÷1-(3×3)+11+7-7+7
11÷1-9+11+7-7+7
11-9+11+7-7+7
2+11+7-7+7
13+7-7+7
6+7+7
13+7=20