A, \(\dfrac{4}{9}+x=\dfrac{5}{3}\)

\(x\)\(=\dfrac{5}{3}-\dfrac{4}{9}\)

\(x\)\(=\dfrac{11}{9}\)

B,\(\dfrac{3}{4}.x=\dfrac{-1}{2}\)

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

\(x=\)\(\dfrac{-2}{3}\)

Câu rút gọn là câu được rút ngắn thành phần chính trong câu và có thể khôi phục 

VD:Ngày mai,đi học

1 Yes, environmental pollution is a big problem nowadays
2 I limit the use of plastic bags, do not litter indiscriminately and plant many trees and green hills
3 Yes, I am very worried about that problem

4 Yes, I do

5 Yes, I am very interested and love nature

C

Biện pháp nghệ thuật :So sánh

Tác dụng :Làm cho âm thanh tiếng suối vô hồn lạnh lẽo trở nên sống động ,có hồn

You should not go to the swimming pool now because it is winter and it is very cold. If you go out wearing little clothes or go swimming or eat cold drinks you will get sick or get a sore throat. If you are sick you will miss out. tomorrow's class it's very interesting and wonderful so take care of yourself.