Question

a) ( 1/3 - 1/4 ) + ( 1/4 - 1/5 ) +

( 1/5 - 1/6 ) + ( 1/6 - 1/7 ) + ( 1/7 - 1/8 )

b) 10/17 - 5/13 - -7/17 - 8/13

Giúp ạ! 

Answer 1

a.\(\left(\frac{1}{3}-\frac{1}{4}\right)+\left(\frac{1}{4}-\frac{1}{5}\right)+\left(\frac{1}{5}-\frac{1}{6}\right)+\left(\frac{1}{6}-\frac{1}{7}\right)+\left(\frac{1}{7}-\frac{1}{8}\right)=\)

\(\frac{1}{3}-\frac{1}{4}+\frac{1}{4}-\frac{1}{5}+\frac{1}{5}-\frac{1}{6}+\frac{1}{6}-\frac{1}{7}+\frac{1}{7}-\frac{1}{8}=\frac{1}{3}-\frac{1}{8}=\frac{5}{24}\)

Answer 2

b. \(\frac{10}{17}-\frac{5}{13}-\frac{7}{17}-\frac{8}{13}=\left(\frac{10}{17}-\frac{7}{17}\right)-\left(\frac{5}{13}+\frac{8}{13}\right)=1-1=0\)