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Se da x\8=5\y.Se cere: a)xy b)2xy c)2xy-1

Răspuns :

x/8=5/y
a) x*y=8*5=40
b)2*x*y=2*40=80
c)2*x*y-1=80-1=79

a)xy=40
b)2x40=80
c)2x40-1=79