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grupati termeni pentru a calcula cat mai repede 2/7+2/5+3/7+1/5+2/7+7/5=

Răspuns :

Merry01
(2/7+3/7+2/7) + (2/5+1/5+7/5) =7/7+ 10/5=1+2=3
2/7+2/5+3/7+1/5+2/7+7/5=10+14+15+7+10+49/35=105/35=3

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