2 câu trả lời
`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: \[\begin{array}{l} x \times 2\frac{2}{1} + x \times \frac{1}{2} = 27\\ x \times 2.2 + \frac{x}{2} = 27\\ 4x + \frac{x}{2}\,\,\,\,\,\,\,\,\,\, = 27\\ \frac{{8x}}{2} + \frac{x}{2}\,\,\,\,\,\,\,\,\, = 27\\ \,\,\,\,\,\,\,\,\frac{{9x}}{2}\,\,\,\,\,\,\,\,\,\,\, = 27\\ \,\,\,\,\,\,\,\,\,9x\,\,\,\,\,\,\,\,\,\,\, = 27 \times 2\\ \,\,\,\,\,\,\,\,\,9x\,\,\,\,\,\,\,\,\,\,\, = 54\\ \,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\, = 54:9\\ \,\,\,\,\,\,\,\,\,\,\,\,x\,\,\,\,\,\,\,\,\,\,\, = 6. \end{array}\]