Question

Ayuda porfa es para mañana resueltos sii
-2/8-2/5-3/4
1/8-(-2/5)-3/4
2/3+2/6+3/9
(-3/4)(-2/5) (3/8)
-3/7÷-1/4

Answer 1

Los resultados de los ejercicios son los siguiente:

$-\frac{2}{8}-\frac{2}{5}-\frac{3}{4}=-\frac{7}{5}$

$\frac{1}{8}-\left(-\frac{2}{5}\right)-\frac{3}{4}=-\frac{9}{40}\quad$

$\frac{2}{3}+\frac{2}{6}+\frac{3}{9}=\frac{4}{3}$

$\left(-\frac{3}{4}\right)\left(-\frac{2}{5}\right)\left(\frac{3}{8}\right)=\frac{9}{80}$

$-\frac{\frac{3}{7}}{-\frac{1}{4}}=\frac{12}{7}\quad$

1)

$-\frac{2}{8}-\frac{2}{5}-\frac{3}{4} =-\frac{1}{4}-\frac{2}{5}-\frac{3}{4} =-1-\frac{2}{5} =-\frac{1\cdot \:5}{5}-\frac{2}{5} =\frac{-7}{5} =-\frac{7}{5}$

2)

$1/8-(-2/5)-3/4=\frac{1}{8}+\frac{2}{5}-\frac{3}{4}=\frac{5}{40}+\frac{16}{40}-\frac{30}{40}=\frac{5+16-30}{40}=\frac{-9}{40}=-\frac{9}{40}$

3)

$\frac{2}{3}+\frac{2}{6}+\frac{3}{9}=\frac{2}{3}+\frac{1}{3}+\frac{3}{9}=\frac{2}{3}+\frac{1}{3}+\frac{1}{3}=\frac{2+1+1}{3}=\frac{4}{3}$

4)

$\left(-\frac{3}{4}\right)\left(-\frac{2}{5}\right)\left(\frac{3}{8}\right)=\frac{3}{4}\cdot \frac{2}{5}\cdot \frac{3}{8}=\frac{3\cdot \:2\cdot \:3}{4\cdot \:5\cdot \:8}=\frac{18}{4\cdot \:5\cdot \:8}=\frac{18}{160}=\frac{9}{80}$

5)

$-\frac{\frac{3}{7}}{-\frac{1}{4}}=-\left(-\frac{12}{7}\right)=\frac{12}{7}$

Multiplicación de Fracciones

$\frac{a}{b}\cdot \frac{c}{d}=\frac{a\:\cdot \:c}{b\:\cdot \:d}$

Combinación de Fracciones

$\frac{a}{c}\pm \frac{b}{c}=\frac{a\pm \:b}{c}$

Propiedad de Fracciones

$\frac{-a}{b}=-\frac{a}{b}$