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efectuati
2 supra 13 + 5 supra 26
7 supra 10 + 13 supra 100
8 supra 25 + 12 supra 50
9 supra 36 + 5 supra 72


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Răspuns :

Kra27

[tex] \frac{2}{13} + \frac{5}{26} = \frac{4}{26} + \frac{5}{26} = \frac{4 + 5}{26} = \frac{9}{26 } [/tex]

[tex] \frac{7}{10} + \frac{13}{100} = \frac{70}{100} + \frac{13}{100} = \frac{70 + 13}{100} = \frac{83}{100} [/tex]

[tex] \frac{8}{25} + \frac{12}{50} = \frac{16}{50} + \frac{12}{50} = \frac{16 + 12}{50} = \frac{28}{50} = \frac{14}{25} [/tex]

[tex] \frac{9}{36} + \frac{5}{72} [/tex]=

18/72+5/72=18+5/72=25/72.

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