chỗ học mà cứ lm như facebook zalo thế chế-.-

a) 1\(\dfrac{1}{5}\).x+\(\dfrac{4}{5}\)=-\(\dfrac{3}{7}\)

1\(\dfrac{1}{5}\).x =-\(\dfrac{3}{7}\)-\(\dfrac{4}{5}\)

1\(\dfrac{1}{5}\).x =-\(\dfrac{43}{35}\)

\(\Rightarrow\)x=-\(\dfrac{43}{35}\):1\(\dfrac{1}{5}\)=-\(\dfrac{43}{42}\)

b)(x+\(\dfrac{1}{3}\))+1=4

x+\(\dfrac{1}{3}\) =4-1

x+\(\dfrac{1}{3}\) =3

\(\Rightarrow x=3-\dfrac{1}{3}=\dfrac{8}{3}\)

TICK HỘ NHA!