Explicație pas cu pas:
[tex]a) \frac{7}{4} - 1 = \frac{7 - 4}{4} = \frac{3}{4} \\ b) \: 3 \frac{3}{4} + 2 \frac{5}{8} = \\ \frac{3 \times 4 + 3}{4} + \frac{2 \times 8 + 5}{8} = \\ \frac{15}{4} + \frac{21}{8} = \frac{30 + 21}{8} = \frac{51}{8} \\ c) \: [/tex]
[tex]c) \: \frac{5}{24} \times \frac{8}{15} = \frac{1}{3 \times 3} = \frac{1}{9} \\ d) \: \frac{21}{32} \times \frac{72}{35} = \frac{3 \times 72}{32 \times 5} = \frac{3 \times 9}{4 \times 5} = \frac{27}{20} [/tex]
