Đáp án:
3$\dfrac{1}{4}$ + $\dfrac{1}{4}$$x$=4
$\dfrac{13}{4}$+ $\dfrac{1}{4}$ $x$=4
$\dfrac{1}{4}$ $x$=4-$\dfrac{13}{4}$
$\dfrac{1}{4}$$x$= $\dfrac{16}{4}$+$\dfrac{13}{4}$
$\dfrac{1}{4}$$x$= $\dfrac{13}{4}$
$x$= $\dfrac{13}{4}$: $\dfrac{1}{4}$
$x$=13
4$\dfrac{1}{5}$-$\dfrac{1}{5}$$x$=6
$\dfrac{21}{5}$-$\dfrac{1}{5}$$x$=6
$\dfrac{1}{5}$ $x$=$\dfrac{21}{5}$ -6
$\dfrac{1}{5}$ $x$=$\dfrac{21}{5}$-$\dfrac{30}{5}$
$\dfrac{1}{5}$ $x$= $\dfrac{-9}{5}$
$x$= $\dfrac{-9}{5}$ : $\dfrac{1}{5}$
$x$=9
$\huge\text{#LunarKim}$
