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Răspuns :

a) amplificam cu 4 si ne da 3*4/25*4 =12/100
b)                        5               5*5/2*5 =25/10
c)                        2                4*2/5*2 =8/10
d)                        5                9*5/20*5 = 45/100
e)                        8                7*8/125*8 = 56/1000
f)                        25               3*25/40*25=75/1000