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9+6×[7+5×(5+2×a)]=681






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Răspuns :

9+6x[7+5x(5+2a)]=681
6x[7+5x(5+2a)]=681-9=672
7+5x(5+2a)=672:6=112
5x(5+2a)=112-7=105
5+2a=105:5=21
2a=21-5=16
a=16:2=8