Question

Tính a) 1/6 + -2/5. b) (-2) + -5/8. c) 6/13 + -14/39 d) 3/5 - 5/6. e) -5/9 - -5/12

Answer 1

a: =5/30-12/30=-7/30

b: =-2-5/8=-16/8-5/8=-21/8

c: =6/13-14/39=18/39-14/39=4/39

d: =18/30-25/30=-7/30

e: =-5/9+5/12=-20/36+15/36=-5/36

Answer 2

a) \(\dfrac{-7}{30}\)

b) \(\dfrac{-21}{8}\)

c) \(\dfrac{-7}{30}\)

d) \(\dfrac{-5}{36}\)

Answer 3

\(a,\dfrac{1}{6}+\dfrac{-2}{5}=\dfrac{5}{30}+\dfrac{-12}{30}=\dfrac{-7}{30}\\ b,\left(-2\right)+\dfrac{-5}{8}=\dfrac{-16}{8}+\dfrac{-5}{8}=\dfrac{-21}{8}\\ c,\dfrac{6}{13}+\dfrac{-14}{39}=\dfrac{18}{39}+\dfrac{-14}{39}=\dfrac{4}{39}\\ d,\dfrac{3}{5}-\dfrac{5}{6}=\dfrac{18}{30}-\dfrac{25}{30}=\dfrac{-7}{30}\\ e,\dfrac{-5}{9}-\dfrac{-5}{12}=\dfrac{-20}{36}-\dfrac{-15}{36}=\dfrac{-5}{36}\)

Answer 4

tìm x biết:-28/3=16/x bằng bao nhiêu