cíu em với ạ các anh chị ơi

` # Traam `

` 17 ) `

` (x - 1 ) ( (-1)/2 . x - 5 ) = 0 `

` T H 1 : `

` x - 1 = 0 `

` x = 0 + 1 `

` x = 1 `

` T H 2 : `

` (-1)/2 . x - 5 = 0 `

` (-1)/2 . x = 0 + 5 `

` (-1)/2 . x = 5 `

` x = 5 : (-1)/2 `

` x = -10 `

Vậy ` x  ∈ { 1   ;  -10 } `

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` 18 ) `

` (3 2/3 - x )(x-3/4)=0 `

` ( 11/3 - x )(x -3/4) = 0 `

` T H 1 : `

` 11/3 - x= 0 `

` x = 0 + 11/3 `

` x = 11/3 `

`T H 2 : `

` x - 3/4 = 0 `

` x = 0 + 3/4 `

` x = 3/4 `

Vậy ` x ∈ { 11/3    ;   3/4 } `

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` 19 ) `

` ( x - 1/2)(3/4x - 4/5 ) = 0 `

` T H 1 : `

` x -1/2 = 0 `

` x = 0 + 1/2 `

` x =1 `

` T H 2 : `

` 3/4 x - 4/5 = 0 `

` 3/4 x = 0 + 4/5 `

` 3/4 x = 4/5 `

` x = 4/5 : 3/4 `

` x = 16/15 `

Vậy ` x  ∈ { 1/2   ;   16/15 } `