Răspuns:
[tex]a)1 \frac{7}{15} + \frac{4}{5} = \\ \frac{22}{15} + ^{3} \frac{4}{5} = \\ \frac{22}{15 } + \frac{12}{15} = \frac{34}{15} \\ \\ \frac{22}{15 } - \frac{12}{15} = \frac{10}{15} ^{5} = \frac{2}{3} [/tex]
[tex] b)1\frac{3}{4} + 1 \frac{7}{12} = \\ ^{3} \frac{7}{4} + \frac{19}{12} = \\ \frac{21}{12} + \frac{19}{12} = \frac{40}{12} ^{4} = \frac{10}{3} \\ \\ \frac{21}{12} - \frac{19}{12} = \frac{2}{12} ^{2} = \frac{1}{6} [/tex]
