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efectueza in doua moduri 5x77-5x49=

Răspuns :

primul mod: 5×77-5×49=385-245=140
al doilea mod: 5×77-5×49=5×(77-49)=5×28=140
5x77-5x49=385-245=140
5(77-49)=5x28=140
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