Question

alguém consegue fazer p mim? por favor.​

Answer 1

Resposta:

$1.\\ \\ a)\\ \\ \frac{28}{56} =\frac{28:28}{56:28}=\frac{1}{2} \\ \\ b)\\ \\ \frac{36}{72} =\frac{36:36}{72:36} =\frac{1}{2} \\ \\ c)\\ \\ \frac{25}{75} =\frac{25:25}{75:25} =\frac{1}{3}\\ \\ d)\\ \\ \frac{24}{36} =\frac{24:12}{36:12} =\frac{2}{3}$

$2.\\ \\ a)\\ \\ \frac{2}{5}+ \frac{3}{6} =\frac{2}{5} +\frac{1}{2}\\ \\ mmc=10\\ \\ \frac{4+5}{10} =\frac{9}{10} \\ \\ b)\\ \\ \frac{2}{4}-\frac{4}{7} =\frac{1}{2} -\frac{4}{7} \\ \\ mmc=14\\ \\ \frac{7-8}{14} =-\frac{1}{14} \\ \\ c)\\ \\ \frac{5}{8} .\frac{4}{9} =\frac{5.4}{8.9} =\frac{20}{72} =\frac{20:4}{72:4} =\frac{5}{18} \\ \\ d)\\ \\ \frac{2}{7} :\frac{3}{7} =\frac{2}{7}. \frac{7}{3} =\frac{14}{21} =\frac{14:7}{21:7} =\frac{2}{3}$