Question

[Cherry Vương]

bài 1: Tính 

a)  \(\dfrac{-5}{7}\) . \(\dfrac{2}{11}\)  + \(\dfrac{-5}{7}\)  . \(\dfrac{9}{11}\) + 1\(\dfrac{5}{7}\)

b) \(\dfrac{-3}{14}\)  +\(\dfrac{5}{8}\)  -\(\dfrac{1}{2}\)

c) ( \(\dfrac{1}{4}\) +\(\dfrac{-5}{13}\))+( \(\dfrac{2}{11}\) + \(\dfrac{-8}{13}\) + \(\dfrac{3}{4}\)  )

d) (  \(\dfrac{21}{31}\)  + \(\dfrac{-16}{7}\)  )+( \(\dfrac{44}{53}\)  +\(\dfrac{10}{31}\) )+\(\dfrac{9}{53}\)

e) \(\dfrac{1}{9}\) - \(\dfrac{5}{6}\) -4

___________

    \(\dfrac{7}{12}\)  - \(\dfrac{1}{36}\) -10

giúp em

Answer 1

[Nguyễn Lê Phước Thịnh]

a: =-5/7(2/11+9/11)+12/7

=12/7-5/7

=7/7=1

b: \(=\dfrac{-12}{56}+\dfrac{35}{56}-\dfrac{28}{56}=\dfrac{-5}{56}\)

c: \(=\dfrac{1}{4}-\dfrac{5}{13}+\dfrac{2}{11}-\dfrac{8}{13}+\dfrac{3}{4}\)

=1-1+2/11

=2/11

d: \(=\dfrac{21}{31}+\dfrac{-16}{7}+\dfrac{44}{53}+\dfrac{10}{31}+\dfrac{9}{53}\)

=1+1-16/7

=-2/7

e: \(=\dfrac{\dfrac{4}{36}-\dfrac{30}{36}-\dfrac{144}{36}}{\dfrac{21}{36}-\dfrac{1}{36}-\dfrac{360}{36}}=\dfrac{-160}{-340}=\dfrac{8}{17}\)