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a fost răspuns

Calculeza :
a)1/12 x 3/4 x 16/25 + 1/15 x 33/4 x 28/55
b)1/12 x 1/5 + 1/12 x 7/10 + 1/12 x 1/15

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Am nevoie urgent !!! D-au coroana !