Question

Tinh :

a ) 3/17 + ( -5 )/13 - 18/35 + 14/17 + 13/(-35) - 8/13

b ) (-3)/8 . 1/6 + (-3)/8 . 5/6 + (-10)/16

 

Answer 1

a, \(\frac{3}{17}-\frac{5}{13}-\frac{18}{35}+\frac{14}{17}-\frac{13}{35}-\frac{8}{13}\)

\(=\left(\frac{3}{17}+\frac{14}{17}\right)+\left(-\frac{5}{13}-\frac{8}{13}\right)+\left(-\frac{18}{35}-\frac{13}{35}\right)=1-1-\frac{31}{35}=-\frac{31}{35}\)

b, \(\left(-\frac{3}{8}\right).\frac{1}{6}+-\left(\frac{3}{8}\right).\frac{5}{6}-\frac{10}{16}=\left(-\frac{3}{8}\right)\left(\frac{1}{6}+\frac{5}{6}\right)-\frac{10}{16}=-\frac{3}{8}-\frac{5}{8}=-1\)