Question

Giúp mik với ạ 😿🥺 mik đang cần gấp

Answer 1

`4/21+(-5)/8+17/21+(-3)/8`

`=(4/21+17/21)+(-5/8+(-3)/8)`

`=(4/21+17/21)+(-5/8-3/8)`

\(=\left(\dfrac{4+17}{21}\right)+\left(\dfrac{-5-3}{8}\right)\)

`=21/21+(-8/8)`

`=21/21-8/8`

`=1-1`

`=0`

Answer 2

\(\dfrac{4}{21}+\dfrac{-5}{8}+\dfrac{17}{21}+\dfrac{-3}{8}\\ =\left(\dfrac{4}{21}+\dfrac{17}{21}\right)+\left(-\dfrac{5}{8}-\dfrac{3}{8}\right)\\ =\dfrac{21}{21}+\dfrac{-8}{8}=1-1=0\)

Answer 3

\(\dfrac{4}{21}+\dfrac{-5}{8}+\dfrac{17}{21}+\dfrac{-3}{8}\)

= (4/21+17/21)+(-5/8+ -3/8)

= 1+(-1)=0