Bài 2 (2 điểm): Tìm x, biết a) x-$\frac{4}{9}$ = $\frac{5}{6}$ + $\frac{1}{2}$ b) $\frac{2}{5}$ + $\frac{3}{5}x$ = $\frac{-1}{3}$ c) $4\frac{5}{11}x$ -$1\frac{5}{11}x $ =$\frac{9}{7}$  

Đáp án + Giải thích các bước giải:

`a)` `x` `-` `4/9` `=` `5/6` `+` `1/2`

`x` `-` `4/9` `=` `5/6` `+` `3/6`

`x` `-` `4/9` `=` `4/3`

`x` `=` `4/3` `+` `4/9`

`x` `=` `12/9` `+` `4/9`

`x` `=` `16/9`

`Vậy` `x` `=` `16/9`

`b)` `2/5` `+` `3/5x` `=` $\dfrac{-1}{3}$

`3/5` `.` `x` `=` $\dfrac{-1}{3}$ `-` `2/5`

`3/5` `.` `x` `=` $\dfrac{-5}{15}$ `-` `6/15`

`3/5` `.` `x` `=` $\dfrac{-11}{15}$

`x` `=` $\dfrac{-11}{15}$ `:` `3/5`

`x` `=` $\dfrac{-11}{15}$ `.` `5/3`

`x` `=` $\dfrac{-11}{9}$

`Vậy` `x` `=` $\dfrac{-11}{9}$

`c)` `4``5/11``x` `-` `1``5/11``x` `=` `9/7`

`x` `.` `(` `4``5/11` `-` `1``5/11` `)` `=` `9/7`

`x` `.` `(` `49/11` `-` `16/11` `)` `=` `9/7`

`x` `.` `3` `=` `9/7`

`x` `=` `9/7` `:` `3`

`x` `=` `9/7` `.` `1/3`

`x` `=` `3/7`

`Vậy` `x` `=` `3/7`

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