X x 2 2phan 1 +X x 1 phan 2 =27

`x` `xx` `2 2/1` `+` `x` `xx` `1/2` `=` `27`

`=>` `x` `xx` `4` `+` `xx` `1/2` `=` `27`

`=>` `x` `xx` `(4` `+` `1/2` `)` `=` `27`

`=>` `x` `xx` `9/2` `=` `27`

`=>` `x` `=`  `27` `:` `9/2`

`=>` `x` `=` `6`

Vậy: `x` `=` `6`

Đáp án:

$x=6$

Giải thích các bước giải: $\begin{array}{l} x \times 2\frac{2}{1} + x \times \frac{1}{2} = 27\\ x \times 2.2 + \frac{x}{2} = 27\\ 4x + \frac{x}{2}\,\,\,\,\,\,\,\,\,\, = 27\\ \frac{{8x}}{2} + \frac{x}{2}\,\,\,\,\,\,\,\,\, = 27\\ \,\,\,\,\,\,\,\,\frac{{9x}}{2}\,\,\,\,\,\,\,\,\,\,\, = 27\\ \,\,\,\,\,\,\,\,\,9x\,\,\,\,\,\,\,\,\,\,\, = 27 \times 2\\ \,\,\,\,\,\,\,\,\,9x\,\,\,\,\,\,\,\,\,\,\, = 54\\ \,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\, = 54:9\\ \,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\, = 6. \end{array}$