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Daca 36/72=x/y si x/y ireductibila,determinati x/y

Daca 3/x=y/4,x#0 atunci determinați 4•xy_20


Răspuns :

a)x/y=36/72 
x/y=1/2
b)3/x=y/4
xy=3*4
xy=12
4*12-20=48-20=28