Question

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Answer 1

Bài `1`

`a, (-2)/13 + (-11)/26`

`= -4/26 - 11/26`

`= -15/26`

`b, -2 + (-5)/8`

`= (-16)/8 - 5/8`

`= -21/8`

`c, (-13)/15 + 5/(-18)`

`= -78/90-25/90`

`= -103/90`

Answer 2

Bài `2`

`a, (-2)/5 - (-3)/11`

`= -2/5 + 3/11`

`= -22/55 + 15/55`

`= -7/55`

`b, 13/30 - 1/5`

`= 13/30 - 6/30`

`= 7/30`

`c, (-4) - (-4/5)`

`= -20/5 + 4/5`

`= -16/5`

Answer 3

Bài 1:
\(a,\dfrac{-2}{13}+\dfrac{-11}{26}=\dfrac{-4}{26}-\dfrac{11}{26}=\dfrac{-15}{26}\)
\(b,-2+\dfrac{-5}{8}=\dfrac{-16}{8}-\dfrac{5}{8}=\dfrac{-21}{8}\)
\(c,\dfrac{-13}{15}+\dfrac{5}{-18}=\dfrac{-13}{15}-\dfrac{5}{18}=\dfrac{-78}{90}-\dfrac{25}{90}=\dfrac{-103}{90}\)
Bài 2:
\(a,\dfrac{-2}{5}-\dfrac{-3}{11}=\dfrac{-2}{5}+\dfrac{3}{11}=\dfrac{-22}{55}+\dfrac{15}{55}=\dfrac{-7}{55}\)
\(b,\dfrac{13}{30}-\dfrac{1}{5}=\dfrac{13}{30}-\dfrac{6}{30}=\dfrac{7}{30}\)
\(c,\left(-4\right)-\left(-\dfrac{4}{5}\right)=\dfrac{-20}{5}+\dfrac{4}{5}=\dfrac{-16}{5}\)