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1+{2+[3×(4+5)-6]+7×8}-9=

Răspuns :

1+(2+21+7x8)-9=1+(2+21+56)-9=1+79-9=71

1+{2+[3x(4+5)-6]+7x8}-9= =1+[(3x9-6)+56]-9= =1+[(27-6)+56]-9= =1+(21+56)-9= =1+77-9= =78-9= =69