Question

b=-1/2-(-3/5) +(-1/9)+1/131-(-2/7)+4/35-7/18

Answer 1

......................?

mik ko biết

mong bn thông cảm 

nha ................

Answer 2

$\frac{-1}{2}-\frac{-3}{5}+\frac{-1}{9}+\frac{1}{131}-\frac{-2}{7}+\frac{4}{35}-\frac{7}{18}$

$=\frac{-1}{2}+\frac{3}{5}-\frac{1}{9}+\frac{1}{131}+\frac{2}{7}+\frac{4}{35}-\frac{7}{18}$

$=\frac{1}{10}-\frac{122}{1179}+\frac{2}{5}-\frac{7}{18}$

$=-\frac{41}{11790}+\frac{1}{90}$

$=\frac{1}{131}$