Sagot :
Réponse:
[tex] \frac{1}{2} + \frac{7}{8} = \frac{1 \times 4}{2 \times 4} + \frac{7}{8} = \frac{4 + 7}{8} = \frac{11}{8} [/tex]
[tex] \frac{3}{5} + \frac{1}{15} = \frac{3 \times 3}{5 \times 3} + \frac{1}{15} = \frac{9 + 1}{15} = \frac{10 \div 5}{15 \div 5} = \frac{2}{3} [/tex]
[tex] \frac{3}{5} - \frac{2 \div 2}{10 \div 2} = \frac{3}{5} - \frac{1}{5} = \frac{2}{5} [/tex]
[tex]2 + \frac{11}{7} = \frac{2 \times 7}{1 \times 7} + \frac{11}{7} = \frac{14 + 11}{7} = \frac{25}{7} [/tex]
Réponse:
a)
[tex] \frac{1}{2} + \frac{7}{8} = \frac{8}{16} + \frac{14}{16} = \frac{22}{16} = \frac{11}{8} [/tex]
b)
[tex]\frac{3}{5} + \frac{1}{15} = \frac{3 \times 3}{5 \times 3} + \frac{1}{15} = \frac{10}{15} [/tex]
c)
[tex]\frac{3}{5} - \frac{2}{10} = \frac{3 \times 2}{5 \times 2} + \frac{2}{10} = \frac{8}{10} [/tex]
d)
[tex]2 + \frac{11}{7} = \frac{(2 \times 7) + 11}{7} = \frac{14 + 11}{7} = \frac{25}{7} [/tex]