Răspuns:
a. 5/8; b. 2/3; c. 17/18; d. 28/3; e. 17/7
Explicație pas cu pas:
a.
[tex] \frac{1}{8} + \frac{1}{8} \times 4 = \frac{1}{8} \times (1 + 4) = \frac{5}{8} [/tex]
b.
[tex] \frac{1}{6} + \frac{1}{6} \div \frac{1}{3} = \frac{1}{6} + \frac{1}{6} \times 3 = \frac{4}{6} = \frac{2}{3} [/tex]
c.
[tex] \frac{4}{9} + \frac{3}{10} \div \frac{6}{10} = \frac{4}{9} + \frac{3}{10} \times \frac{10}{6} = \frac{4}{9} + \frac{1}{2} = \frac{4 \times 2 + 1 \times 9}{2 + 9} = \frac{17}{18} [/tex]
d.
[tex]1 \frac{1}{3} \times 2 \frac{1}{2} + 6 = (1 + \frac{1}{3} ) \times (2 + \frac{1}{2} ) + 6 = \frac{4}{3} \times \frac{5}{2} + 6 = \frac{10}{3} + 6 = 3 + \frac{1}{3} + 6 =9 + \frac{1}{3} = 9 \frac{1}{3} [/tex]
e.
[tex]2 \frac{1}{7} \times 1 \frac{1}{5} - \frac{1}{21} \div \frac{1}{3} = \frac{15}{7} \times \frac{6}{5} - \frac{1}{21} \times \frac{3}{1} = \frac{18}{7} - \frac{1}{7} = \frac{17}{7} = 2 \frac{3}{7} [/tex]
