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Aflati x din proportiile:
28/x=21/7
x/125=12/25
12/17=6/x

Răspuns :

Nitugheorghe57
28/X=21/7⇒21X=28×7⇒21X=196⇒X=196/21
X/125=12/25⇒25X=12×125⇒25X=1500⇒X=1500/25⇒X=60
12/17=6/X⇒12X=6×17⇒12X=102⇒X=102/12
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