1. Tính:

-5/7 - 3/14 + 11/21

-5/21 + 9/28 

Tìm x:

a. 2 - 3x = -1

b. x + 2x + 3x + 4x - 5x = 16

c. \(\dfrac{1}{5}-x:\dfrac{2}{3}=\dfrac{3}{4}\)

d. \(\left(3.x-\dfrac{1}{2}\right):3-4=\dfrac{1}{5}\)

1. Tính: 

a. \(\dfrac{11}{17}.\dfrac{19}{23}+\dfrac{11}{17}:\dfrac{23}{4}\)

b.\(\dfrac{-1}{2}-\dfrac{-3}{2}:\left(\dfrac{1}{2}-\dfrac{3}{4}\right)^2\)

c.\(\left(\dfrac{31}{15}+\dfrac{41}{25}-\dfrac{-51}{35}\right)\left(\dfrac{1}{2}-\dfrac{1}{3}-\dfrac{1}{6}\right)\)

d. \(\dfrac{-2}{3}+\dfrac{-3}{2}-\dfrac{-7}{8}\)

Cho em hỏi môn N.Văn khó lắm hay sao ạ? mk cần nắm chắc những kiến thức nào nhỉ?