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14 si 15

Răspuns:
14)
3/4=9/12=27/36=81/108=243/324
b)a/b=c/d=8/12=16/24=32/48
15)a)2x/3y=4/7
b)x+y/y=14/7=2
c)x/y-x=2/5
d)2x+3y/5y=4+21/35=25/35=5/7