Explicație pas cu pas:
[tex] \frac{ 7 }{10} + \frac{5}{12} = \frac{12}{22} [/tex]
[tex] \frac{19}{18} - \frac{5}{12} = \frac{14}{16} [/tex]
[tex]3 \times \frac{5}{9 } + 7 \times \frac{1}{6} = \frac{15}{27} + \frac{7}{42} = \frac{22}{69} [/tex]
[tex]4 \times \frac{1}{3} \ \times \frac{3}{10} = \frac{ {4}^{2} }{12} \times \frac{3}{10} = \frac{2}{6} \times \frac{3}{10} = \frac{6}{60} [/tex]
