Question

bài 1

a,1/-2+2/3     b,-3/4-4/5     c,-5/9- (-5/12)

Answer 1

a: =-1/2+2/3=-3/6+4/6=1/6

b: =-15/20-16/20=-31/20

c: =-5/9+5/12=-60/108+45/108=-15/108=-5/36

Answer 2

\(a.\dfrac{1}{-2}=\dfrac{-1}{2}\)

 

\(\dfrac{-3}{6}+\dfrac{4}{6}=\dfrac{1}{6}\)

\(b.\dfrac{-15}{20}-\dfrac{16}{20}=\dfrac{-31}{20}\)

\(c.\dfrac{-5}{9}+\dfrac{5}{12}=\dfrac{-60}{108}+\dfrac{45}{108}=\dfrac{-15}{108}\)