Question

me ajudem por favor ta muito difícil ​

Answer 1

Acho que é isso:

a)

$\frac{1}{3} . (\frac{3}{5}+\frac{1}{2})\\\\\\\\\frac{1}{3} . \frac{6 + 5}{10} \\\\\\\frac{1}{3} . \frac{11}{10} = \frac{11}{30} = 0,3666666$

b)

$\frac{5}{2} . (\frac{4}{3} - \frac{3}{4} )\\\\\frac{5}{2} . (\frac{16 - 9}{12} )\\\\\frac{5}{2} . \frac{7}{12} = \frac{35}{24} = 1,458333$

c)

$(\frac{5}{4} -\frac{1}{2} ) . (\frac{1}{3} + \frac{2}{5} ) = \\\\(\frac{5}{4} - \frac{1}{2} ) = \frac{10 - 4}{8} = \frac{6}{8} \\\\(\frac{1}{3} + \frac{2}{5} ) = \frac{6 + 5}{15} = \frac{11}{15} = 0,7333$