Question

Cộng các phân số sau .

a) 270/-450 + 4545/5454

b) -33/429 + -156/-26 + 224/-84

c) 405/-567 + -161/552 + 162/-243

d) -2/3 . ( 2/18 + -6/12 - 3/33 )

GIÚP MIH VỚI

Answer 1

a) \(\frac{270}{-450}+\frac{4545}{5454}=-\frac{3}{5}+\frac{5}{6}=\frac{7}{30}\)

b) \(\frac{-33}{429}+\frac{-156}{-26}+\frac{224}{-84}=\frac{-1}{13}+6+\frac{-56}{21}=\frac{127}{39}\)

c) \(\frac{405}{-567}+\frac{-161}{552}+\frac{162}{-243}=-\frac{5}{7}+\frac{-7}{24}+\frac{-2}{3}=\frac{-281}{168}\)

d) \(-\frac{2}{3}\left(\frac{2}{18}+\frac{-6}{12}-\frac{3}{33}\right)=-\frac{2}{3}\left(\frac{1}{9}+\frac{-1}{2}-\frac{1}{11}\right)\)

\(=-\frac{2}{3}.\left(-\frac{95}{198}\right)=\frac{95}{297}\)