Răspuns :
[tex]a)4 \frac{5}{7} = \frac{4 \times 7 + 5}{7} = \frac{33}{7} \\ b)7 \frac{11}{15} = \frac{7 \times 15 + 11}{15} = \frac{116}{15} [/tex]
Explicație pas cu pas:
[tex]4 \times \frac{5}{7} = \frac{4 \times 7 + 5}{7} = \frac{33}{7} [/tex]
[tex]7 \times \frac{11}{15} = \frac{7 \times 15 + 11}{15} = \frac{166}{15} [/tex]