Efectuati: 2/3-1/4 5/4-1/2 5/6-1/3 7/2-1/5 1-2/5 2/5-1/2 11/4-3/2 7/6-3/4 11/12-5/18 13/20-7/30 37/45-17/30 b)Dintr-un balot de panza itr-o zi s-a vandut dimineata 12 m si inca 7/10 iar dupa amiaza 9m si inca 2/10.Aflati lungimea totala a panzei vanduta in aceia zi

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2014-02-09T14:42:31+02:00
B) 12m +  \frac{7}{10}+9m+ \frac{2}{10} =12+9+ \frac{7}{10} + \frac{2}{10} =21m+ \frac{9}{10} = \frac{210}{10}+ \frac{9}{10} = \frac{219}{10} (219/10)
5/6-1/3=3/6,simplifici prin 2 si =1/2
7/2-1/5=32/10,simplifici prin 2 si =16/5
1-2/5=5/5-2/5=3/5
2/5-1/2=-1/10 (e gresit ex.)
11/4-6/4=5/4