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rezolva in doua moduri 7×(9-5)=

Răspuns :

7×(9-5)=7×4=28

7×(9-5)=7×9-7×5=63-35=28
1 mod
7x(9-5)=7x4=28
2 mod
7x(9-5)=7x9-7x5=63-35=28