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30 tháng 5 2021

Mọi người giúp mình với mình đang cần gấp mình cảm ơn nhiều ạ

18 tháng 12 2021

11-year-old son

18 tháng 12 2021

11-year-old son

 

11 tháng 11 2021

leuleuem ko biết hả

 

29 tháng 7 2021

a, \(f\left(x\right)=2x^4-x^3+4x^2-x\)

\(\Rightarrow f'\left(x\right)=\left(2x^4-x^3+4x^2-x\right)'\)

\(=\left(2x^4\right)'-\left(x^3\right)'+\left(4x^2\right)'-\left(x\right)'\)

\(=2.4x^3-3x^2+4.2x-1\)

\(=8x^3-3x^2+8x-1\)

b, \(f\left(x\right)=2sinx\)

\(\Rightarrow f'\left(x\right)=\left(2sinx\right)'=2cosx\)

c, \(f\left(x\right)=\dfrac{3x^2+2x-5}{x}\)

\(\Rightarrow f'\left(x\right)=\left(\dfrac{3x^2+2x-5}{x}\right)'\)

\(=\left(3x+2-\dfrac{5}{x}\right)'\)

\(=\left(3x\right)'+\left(2\right)'-\left(\dfrac{5}{x}\right)'\)

\(=3+0+\dfrac{5}{x^2}=\dfrac{5}{x^2}+3\)

2 tháng 1 2022

1, The homework is too difficult for him to do

2, The homework isn't easy enough for him to do

3, The homework is so difficult that he can't do it

4, It is such difficult homework that he can't do it

7 tháng 1 2022

1. My sister says she went to school by bus this morning.

    My sister said she had gone to school by bus that morning.

2. Nga says she have done her homework.

    Nga said she had done her homework.

7 tháng 1 2022

1, My sister says that she goes to school by bus this morning

My sister said that she had gone to school by bus this morning

2, Nga says that she have done her homework

Nga said that she had done her homework

3 tháng 3 2022

1. many -> much

2. a apple -> an apple

3. Theirs -> Their

4. ???

5. visiting -> to visit

6. were -> was

2 tháng 1 2022

is a big supermarket next to our school

not met him for 3 months

10-day Tet holiday

24 tháng 12 2021

1.........................................

=>the computer hasn't been fixed by them yet

2.......................................

=>Last night I was helped by a stranger.