Question

giúp mình với mình cảm ơn

Answer 1

`[5]`

`a, = 7/12 xx 11/21 + 7/12 xx 10/21`

`= 7/12 xx (10+11)/21`

`= 7/12`

`b, = 3/5 . -4/29 + 2/5 . -4/29 + 33/29`

`= -4/29 . 1 + 33/29`

`= -4/29 + 33/29`

`= 29/29 = 1`

Answer 2

a: \(A=\dfrac{7}{12}\cdot\dfrac{11}{21}+\dfrac{7}{12}\cdot\dfrac{10}{21}=\dfrac{7}{12}\)

b: \(B=\dfrac{-4}{29}\left(\dfrac{3}{5}+\dfrac{2}{5}\right)+\dfrac{33}{29}=\dfrac{33}{29}-\dfrac{4}{29}=1\)