2 câu trả lời
$x$ $\times$ $13$ $:$ $x$ $+$ $65$ $:$ $x$ $=$ $18$
$⇔$ $(x:x)$ $\times$ $13$ $+$ $65$ $:$ $x$ $=$ $18$
$⇔$ $13$ $+$ $65$ $:$ $x$ $=$ $18$
$⇔$ $65$ $:$ $x$ $=$ $18$ $-$$13$
$⇔$ $65$ $:$ $x$ $=$ $5$
$⇔$ $x$ $=$ $65$ $:$ $5$
$⇔$ $x$ $=$ $13$
CHÚC BẠN HỌC TỐT
`x xx 13 : x + 65 : x = 18`
`( x : x ) xx 13 + 65 : x = 18`
`13 + 65 : x = 18`
`65 : x = 18 - 13`
`65 : x = 5`
`x = 65 : 5`
`x = 13`