72^3*54^2=1088391168

108^4=136048896

bạn chấm điểm cho mik với nhé ;)))

câu b 

3^10.11+3^10x5  = 3^10.16  = 3.3.3^8.2.8   =3^8.2

   39.24                      39.24       3.13.3.8         13

mik ghi xuống dòng như vậy là giống phân số á bn, lm đúng ko thì ko chắc :)))

có z sai nhờ mn sửa giúp :>>>>

a) Ta có: \(x^2-3=0\)

nên \(x^2=3\)

hay \(x\in\left\{\sqrt{3};-\sqrt{3}\right\}\)

b) Ta có: \(4x^2-9=0\)

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

\(\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{3}{2}\\x=-\dfrac{3}{2}\end{matrix}\right.\)

c) Ta có: \(\left(x+2\right)^2-\left(x-2\right)^2=5\)

\(\Leftrightarrow x^2+4x+4-x^2+4x-4=5\)

\(\Leftrightarrow8x=5\)

hay \(x=\dfrac{5}{8}\)

d) Ta có: \(\left(x+2\right)^3-x^3+6x^2=7\)

\(\Leftrightarrow x^3+6x^2+12x+8-x^3+6x^2-7=0\)

\(\Leftrightarrow12x^2+12x+1=0\)

\(\Delta=12^2-4\cdot12\cdot1=144-48=96\)

Vì Δ>0 nên phương trình có hai nghiệm phân biệt là:

\(\left\{{}\begin{matrix}x_1=\dfrac{-12-4\sqrt{6}}{24}=\dfrac{-3-\sqrt{6}}{6}\\x_2=\dfrac{-12+4\sqrt{6}}{24}=\dfrac{-3+\sqrt{6}}{6}\end{matrix}\right.\)

e) Ta có: \(\left(x-2\right)^2-\left(x-1\right)\left(x+1\right)=7\)

\(\Leftrightarrow x^2-4x+4-x^2+1=7\)

\(\Leftrightarrow-4x=2\)

hay \(x=-\dfrac{1}{2}\)

a) Ta có: \(P\left(x\right)=7x^3+3x^4-x^2+5x^2-6x^3-2x^4+2017-x^3\)

\(=x^4+4x^2+2017\)

b) Bậc của P(x) là 4

c) Các hệ số của P(x) là 1;4;2017

Hệ số cao nhất là 4

Hệ số tự do là 2017

d) \(P\left(0\right)=0^4+4\cdot0^2+2017=2017\)

\(P\left(1\right)=1^4+4\cdot1^2+2017=1+4+2017=2022\)

\(P\left(-1\right)=\left(-1\right)^4+4\cdot\left(-1\right)^2+2017=1+4+2017=2022\)

e) \(P\left(-a\right)=\left(-a\right)^4+4\cdot\left(-a\right)^2+2017=a^4+4a^2+2017\)

\(P\left(a\right)=a^4+4a^2+2017\)

Do đó: P(-a)=P(a)

Câu nào bạn ơi

12 What do you often do after school?

13 What is he doing now?

14 Where are you often have dinner?

15 What is Lan going to buy

16 Where are they going to stay?

17 Why do you like learning English?

18 How many pens does she want>

19 What does Nam have for for lunch

20 How many books does Ha have in the bags?

12. What do you often do after school?

13. What is he doing now?

14. Where do you often have dinner? 

15. What is Lan going to buy?
16. Where are they going to stay?

 17. Why do you like learning English?
18. How many pens does she want?

19. What does Nam have for lunch? 

20. How many books does Ha have in the bags? 

1. A

2. C

3. B

4. A

1) A

2) C

3) B

4) A

1. A. wash

   B. warm

   C. wall

   D. walk

2. A. pan

    B. bag

    C. water

    D. add

3. A. sauce

    B. aunt

    C. caught

    D. daughter

4. A. document

    B. naughty

    C. audience

    D. water