Question

a)-3/4+1/5

b)3/7.2/5-2/5

c)21,45+(-13,24)

d)123,5-14,6.2

giúp mik nha

Answer 1

 -11/20

 -8/35

 8,21

 94,3

Answer 2

a, \(\dfrac{-3}{4}\) + \(\dfrac{1}{5}\)

= \(\dfrac{-15}{20}\) + \(\dfrac{4}{20}\)

= \(\dfrac{-11}{20}\)

b, \(\dfrac{3}{7}.\dfrac{2}{5}-\dfrac{2}{5}\)

= \(\dfrac{6}{35}-\dfrac{2}{5}\)

= \(\dfrac{6}{35}-\dfrac{14}{35}\)

= \(\dfrac{-8}{35}\)