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Mihaela1883
a fost răspuns

(30•10)-(4•a+50•2)=100

Răspuns :

(30•10)-(4•a+50•2)=100; 300-(4a+100)=100; 4a+100=200; 4a=100; a=25;
300-4a-100=100=>-4a=-100 =>a=25

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