ảo ma china :))))))))

khó thế tính mãi mới ra

1+1=2

1 + 1 = 2 bạn nhé!

ví dụ : l + l = ll

chúc bạn học tốt!,!

=2 học tốt

\(y=x^4-3x^2+2\)

\(y'=4x^3-6x\)

\(y'=0\Rightarrow4x^3-6x=0\)

\(\Leftrightarrow x\left(2x^2-3\right)=0\)

\(\Leftrightarrow\orbr{\begin{cases}x=0\\x=\sqrt{\frac{3}{2}}\end{cases}}\)(vì \(x\in\left[0,3\right]\))

\(y\left(0\right)=2,y\left(\sqrt{\frac{3}{2}}\right)=-\frac{1}{4},y\left(3\right)=56\)

Do đó \(miny_{\left[0,3\right]}=min\left\{y\left(0\right),y\left(\sqrt{\frac{3}{2}}\right),y\left(3\right)\right\}=y\left(\sqrt{\frac{3}{2}}\right)=-\frac{1}{4}\)

\(maxy_{\left[0,3\right]}=max\left\{y\left(0\right),y\left(\sqrt{\frac{3}{2}}\right),y\left(3\right)\right\}=y\left(3\right)=56\)

1 + 1 = 2 nha!

#Phương

1+1=2

nha bn

hc tốt

sang năm thi đỗ

1.A 2.D 3.A 4.D 5.D 6.B 7.A 8.A 9.C 10.D

1.D 2.C 3.gạch chân từ nào v ạ? 4.C 5.D 6.D 7.A 8.A 9.A 10.A

1,It wasn't your fault . It was... a accident....

2,Listen ! Can you hear... music... ?

3,I couldn't get into the house because I didn't have... a key....

4,It's very warm to day . Why are you wearing...a coat.... ?

5, Do you take... some sugar.... in you coffee ?

1. It wasn't your fault. It was an accident

2. Listen! Can you hear music?

3. I couldn't get into the house because I didn't have a key

4. It's very warm today. Why are you wearing a coat?

5. Do you take sugar in your coffee?

6. Are you hungry? Would you  a biscuit with your coffee?

7. Our lives would be very difficult without electricity

8. I didn't phone them. I wrote a letter instead.

9. The heart pumps blood through the body.

10. Excuse me, but can I ask you a question?

11. I'm not ready yet. Can you wait a moment, please?

12. We can't delay much longer. We have to make a decision soon.

bằng không biết

= 11 nha