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Daca 2*a=316, calculeaza 2*(a+a)

Răspuns :

2*a=316
2*(a+a)=2*a+2*a=316+316=632

sau alta metoda
2*a=316=>a=316:2=>a=158
2*(158+158)=2*316=632
2a=316
a=316:2
a=158
2(158+158)=2x316=632