`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}$
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