Question

DOY 70 PUNTOS. POR FAVOR AYUDADME
Realiza las siguientes operaciones (;o)
3/5 . (3/4+ 6/12)=?
5/2 ÷ (1/4 - 7/10)=?
(3/4 - 1/5) . 5=?
3/15 . 4/12 ÷ 2/5=?

Answer 1

Hola!

Explicación paso a paso:

$\frac{3}{5} .( \frac{3}{4} + \frac{6}{12} ) \\ = \frac{3}{5} .( \frac{3 \times 3}{4 \times 3} + \frac{6}{12} ) \\ = \frac{3}{5}. ( \frac{9}{12} + \frac{6}{12} ) \\ = \frac{3}{5}.( \frac{15}{12} ) \\ = \frac{45}{60} \\ = \frac{3}{4} \\ \\ \\ \frac{5}{2} \div ( \frac{1}{4} - \frac{7}{10} ) \\ = \frac{5}{2} \div ( \frac{10 - 28}{40} ) \\ = \frac{5}{2} \div ( - \frac{18}{40} ) \\ = \frac{5}{2} \div ( - \frac{40}{18} ) \\ = - \frac{50}{9} \\ \\ \\ ( \frac{3}{4} - \frac{1}{5} ).5 \\ = ( \frac{15 - 4}{20} ).5 \\ = \frac{11}{20} .5 \\ = \frac{11 \times 5}{20} \\ = \frac{11}{4} \\ \\ \\ \frac{3}{15} . \frac{4}{12} \div \frac{2}{5} \\ = \frac{3}{15} . \frac{4}{12} . \frac{5}{2} \\ = \frac{1}{6}$