Đáp án+Giải thích các bước giải:

`b:)` 

`B=3/x-x/(2-x)-(x-6)/(x^2-2x)(xne+-2;xne0)`

`B=3/x+x/(x-2)-(x-6)/(x(x-2))`

`B=(3(x-2)+x*x-x+6)/(x(x-2))`

`B=(3x-6+x^2-x+6)/(x(x-2))`

`B=(x^2+2x)/(x(x-2))`

`B=(x(x+2))/(x(x-2))`

`B=(x+2)/(x-2)` (đpcm)

Vậy ...

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