Question

Answer 1

Bài 2: 

a: =12/20-35/20=-23/20

b: =-16/8-5/8=-21/8

c: =-9/72+(-40)/72=-49/72

d: =18/39-14/39=4/39

e: =-3/4+5/7=-21/28+20/28=-1/28

Answer 2

B1

a \(\dfrac{-2}{3}\)

b \(\dfrac{3}{5}\)

c \(\dfrac{1}{13}\)

d\(\dfrac{3}{7}\)

B2

a\(\dfrac{-23}{20}\)

b \(\dfrac{-21}{8}\)

c \(\dfrac{-49}{72}\)

d\(\dfrac{4}{39}\)

e \(\dfrac{-1}{28}\)