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rezolva te rog(7^2-3^2)=?

Răspuns :

7^2= 49
3^2=6
49-6=43
Asa ca (7^2-3^2)=43
(7^2-3^2)=49-9=40
sau
(7^2-3^2)=(7+3)(7-3)=10*4=40
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