`x:4/9+5/9=13/8````````````````````````````````````````

2 câu trả lời

`x:\frac{4}{9}+\frac{5}{9}=\frac{13}{8}`

`=>x:\frac{4}{9}=\frac{13}{8}-\frac{5}{9}`

`=>x:\frac{4}{9}=\frac{117}{72}-\frac{40}{72}`

`=>x:\frac{4}{9}=\frac{77}{72}`

`=>x=\frac{77}{72}.\frac{4}{9}`

`=>x=\frac{308}{648}`

`=>x=\frac{77}{162}`

Vậy `x=\frac{77}{162}`

$\text{@dieulinh2k7~~}$

$x:$$\frac{4}{9}$ $+$$\frac{5}{9}$ $=$$\frac{13}{8}$

$⇒$$x:$$\frac{4}{9}$$=$$\frac{13}{8}$ $-$$\frac{5}{9}$

$⇒$ $x:$$\frac{4}{9}$$=$$\frac{117}{72}$ $-$$\frac{40}{72}$

$⇒$ $x:$$\frac{4}{9}$$=$$\frac{77}{72}$

$⇒$$x$$=$$\frac{77}{72}$$×$$\frac{4}{9}$

$⇒$ $x$$=$$\frac{77}{162}$  

$\text{Vậy $x$ =}$$\frac{77}{162}$