2 câu trả lời
`( x - 5 )/4 = ( x - 4 )/8`
`[( x - 5 ) xx 2]/( 4 xx 2 ) = ( x - 4 )/8`
`[( x - 5 ) xx 2] /8 = ( x - 4 )/8`
`→ ( x - 5 ) xx 2 = x - 4`
`x × 2 - 5 × 2 = x - 4`
`x × 2 - 10 = x - 4`
`x × 2 = x - 4 + 10`
`x × 2 = x + 6`
`x × 2 - x = 6`
`x = 6`
Vậy `x = 6`
$\text{#lknhatminh0322}$
`x - 5/4 = x - 4/8`
`=> x - x = -4/8 + 5/4`
`=> 0x = 3/4 ` ( Vô lý )
Vậy `x ∈ { ∅ }`