\(5x^2-8xy-4y^2\)

\(=\left(5x^2-10xy\right)+\left(2xy-4y^2\right)\)

\(=5x\left(x-2y\right)+2y\left(x-2y\right)\)

\(=\left(5x+2y\right)\left(x-2y\right)\)

ò cảm ơn nha

câu trả lời là????????????????????????????????

I don't know

`a)\sqrt{16x+48}+\sqrt{x+3}=15`     `ĐK: x >= -3`

`<=>4\sqrt{x+3}+\sqrt{x+3}=15`

`<=>5\sqrt{x+3}=15`

`<=>\sqrt{x+3}=3`

`<=>x+3=9<=>x=6` (t/m).

`b)\sqrt{x^2-4}-3\sqrt{x-2}=0`     `ĐK: x >= 2`

`<=>\sqrt{x-2}(\sqrt{x+2}-3)=0`

`<=>[(\sqrt{x-2}=0),(\sqrt{x+2}=3):}`

`<=>[(x-2=0),(x+2=9):}<=>[(x=2(t//m)),(x=7(t//m)):}`

tui c.ơn cậu nhiều lắm

1 A

2 D

3 B

4 D

5 D

6 D

7 C

8 D

1 A

2 D

3 B

4 D

5 D

6 D

7 C

8 D

M(x)=x^2-6x+15

=x^2-6x+9+6

=(x-3)^2+6>=6>0 với mọi x

=>M(x) ko có nghiệm

1 cultural

2 renewable 

3 so

4 catch

5 When

6 limited

7 will be put

8 B

9 D

10 C

11 A

12 B

III

1 Will you be waiting

2 will be having

3 will send

4 will find

5 will pass

6 will you do

7 will have - will be

I. 1cultural

2.renewable

3.so

4.catch

5.When

6.limited

7.will be put

8.B

9.D

10.C

11.A

12.B

II.

1Will- wait

2.will be having

3.will send

4.will find

5.will pass

6.will - do

7.will have - will be

103 . ( x - 4 ) + 14 = 40

103 x ( x - 4 )        = 40 - 14

103 x ( x - 4 )         = 26

            x - 4             = 26 : 103 

            x - 4              =  26/103

             x                   = 26/103 + 4

              x                  = 438/103.

Chúc bạn học tốt!!!!!!!!!!!!!!

103 x ( x - 4 ) + 14 = 40

103 x ( x - 4 ) = 40 - 14

103 x ( x - 4 ) = 26

x - 4 = 26 : 103

x - 4 = 26/103

x = 26/103 + 4 

x = 438/103

Hok tốt

tách nhỏ ạ

Là hao bạn??