Răspuns:
[tex]a)8 \frac{3}{7} - 2 \frac{2}{5} = \\ = \frac{8 \times 7 + 3}{7} - \frac{2 \times 5 + 2}{5} = \\ = \frac{59}{7} - \frac{12}{5} = \\ aducem \: la \: acelasi \: numitor \: amplificand \: fractiile \\ = \frac{295}{35} - \frac{84}{35} = \\ = \frac{211}{35} \\ [/tex]
[tex]b)3 \frac{11}{15} - 1 \frac{7}{10} = \\ = \frac{3 \times 15 + 11}{15} - \frac{1 \times 10 + 7}{10} = \\ = \frac{56}{15} - \frac{17}{10} = \\ = \frac{112}{30} - \frac{51}{30} = \\ = \frac{61}{30} [/tex]
Sper că te-am ajutat! ^^
