7 supra 23 plus 19 supra 46 minus 5 supra 23 minus 7 supra 46.

[tex] \frac{7}{23} + \frac{19}{46} - \frac{5}{23} - \frac{7}{46} = \\ amplificam \: fractiile \: cu \: numitorul \: 23 \: cu \: 2 \\ = \frac{14}{46} + \frac{19}{46} - \frac{10}{46} - \frac{7}{46} \\ = \frac{33}{46} - \frac{10}{46} - \frac{7}{46} \\ = \frac{23}{46} - \frac{7}{46} \\ = \frac{16}{46} \\ se \: simplifica \: prin \: 2 \\ = \frac{8}{23} [/tex]

Mult succes!

Răspuns:

²⁾7/23+19/46-²⁾5/23-7/46=

14/46+19/46-10/46-7/46=

(16/46)⁽²=

8/23