B - A - D - C - C

\(=\lim\limits_{x\rightarrow-1}\dfrac{\dfrac{x+2017-\left(2015-x\right)}{\sqrt[3]{\left(x+2017\right)^2}+\sqrt[3]{\left(x+2017\right)\left(2015-x\right)}+\sqrt[3]{\left(2015-x\right)^2}}}{\dfrac{2000+x-\left(1998-x\right)}{\sqrt{2000+x}+\sqrt{1998-x}}}\)

\(=\lim\limits_{x\rightarrow-1}\dfrac{\sqrt{2000+x}+\sqrt{1998-x}}{\sqrt[3]{\left(x+2017\right)^2}+\sqrt[3]{\left(x+2017\right)\left(2015-x\right)}+\sqrt[3]{\left(2015-x\right)^2}}\)

\(=\dfrac{\sqrt{1999}+\sqrt{1999}}{\sqrt[3]{2016^2}+\sqrt[3]{2016^2}+\sqrt[3]{2016^2}}=\dfrac{2\sqrt{1999}}{3.24\sqrt[3]{294}}=\dfrac{\sqrt{1999}}{36\sqrt[3]{294}}\)

\(\Rightarrow a+b=1999+294\)

22. It's waste of time to try and explain anything to Henry

→ It's not worth the time to try and explain anything to Henry.

23. She didn't like to learn her lessons in the evening

→ They made her  learn her lessons in the evening.

24. Why did you read this book ? It wasn't useful

→ It's wasn't useful.

25. Could you please turn off the TV ?

→ Would you mind turning off the TV?

22.was making

23.was you doing

24.was looking

25.I was looking

26.has been

27.hasn't read

28.have you drunk

29.have heard

30.has lived

có ai có thể giúp mình làm bài này đc ko