Giúp mình 2,3,4 với ạ. Cảm ơn

$ 2)$ $x+0,25=\dfrac{5}{4}$

$x+\dfrac{1}{4}=$$\dfrac{5}{4}$

$x=\dfrac{5}{4}-$$\dfrac{1}{4}$

$x=\dfrac{4}{4}$

$x=1$

$Vậy$ $x=1$

$3)$ $x+\dfrac{5}{6}=$$\dfrac{1}{3}$

$x=\dfrac{1}{3}-$$\dfrac{5}{6}$

$x=\dfrac{2}{6}-$$\dfrac{5}{6}$

$x=-\dfrac{3}{6}$

$x=-\dfrac{1}{2}$

$Vậy$ $x=-\dfrac{1}{2}$

$4)$ $-\dfrac{2}{15}-x=$$-\dfrac{3}{10}$

$-x=-\dfrac{3}{10}+$$\dfrac{2}{15}$

$-x=-\dfrac{9}{30}+$$\dfrac{4}{30}$

$-x=-\dfrac{1}{6}$

$x=\dfrac{1}{6}$

$Vậy$ $x=\dfrac{1}{6}$