X x 13 :x +65:x =18

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`