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Răspuns :

Mikelina

a)=21/6=7/2

b)=12/12=1

c)=11/50

d)=18/30=3/5

Stancuioanadaria

d) 1/2.3.5+7/2.3.5+10/2.3.5=1/30+7/30+10/30=18/30

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