Bài 2:

a) Để hàm số đồng biến thì m+1>0

hay m>-1

b) Để hàm số đi qua điểm A(2;4) thì

Thay x=2 và y=4 vào hàm số, ta được:

\(\left(m+1\right)\cdot2=4\)

\(\Leftrightarrow m+1=2\)

hay m=1

c) Để hàm số đi qua điểm B(2;-4) thì

Thay x=2 và y=-4 vào hàm số, ta được:

\(2\left(m+1\right)=-4\)

\(\Leftrightarrow m+1=-2\)

hay m=-3

Bài 1:

b) Ta có: \(5\cdot\sqrt{25a^2}-25a\)

\(=5\cdot5\cdot\left|a\right|-25a\)

\(=-25a-25a=-50a\)

a) 

b) \(tanOAB=\dfrac{OB}{OA}=\dfrac{5}{\dfrac{5}{3}}=3\Rightarrow\widehat{OAB}=71^o34'\)

Ta coi hình vẽ là tam giác ABC vuông tại A với B là đỉnh ngọn đèn

góc BCA=30^o(2 góc so le trong)

Theo tỉ số lượng giác trong tam giác vuông ta có:

CA=AB : tan_C30

CA=35:tan30=60,6(m)

Vậy khoảng cách từ chân đèn đến hòn đảo là 60,6m

1A

2B

3B

4C

5A

6B

7D

8A

9C

10B

11C

12C

13A

14A

15D

16B

17D

18B

19D

20B

1A

2 D

3B

4C

5A

6B

7D

8A

9C

10B

11C

12C

13B

14A

15D

16B

17D

18B

19D

20B

a) Ta có: \(\sqrt{12+2\sqrt{35}}-\sqrt{12-2\sqrt{35}}\)

\(=\sqrt{7}+\sqrt{5}-\sqrt{7}+\sqrt{5}\)

\(=2\sqrt{5}\)

b) Ta có: \(\left(\dfrac{5+\sqrt{5}}{\sqrt{5}+1}+2\right)\left(\dfrac{5-\sqrt{5}}{\sqrt{5}-1}-2\right)\)

\(=\left(\sqrt{5}+2\right)\left(\sqrt{5}-2\right)\)

=1

c) Ta có: \(\dfrac{7\sqrt{2}+2\sqrt{7}}{\sqrt{14}}-\dfrac{5}{\sqrt{7}+\sqrt{2}}\)

\(=\sqrt{7}+\sqrt{2}-\sqrt{7}+\sqrt{2}\)

\(=2\sqrt{2}\)

Bài nào ạ

1, What would he like to have for breakfast?

He would like to have a sandwich

2,Who would you like to go fishing with?

I would like to go fishing with my father

3,What would her children like to do in the summer?

They would like to go swimming

4,When would Mrs Tam like to go shopping?

She would like to go shopping at weekends

5,Where would Hung and Tung like to study

They would like to study in the library

1 What would he like for breakfast? 

He'd like a sandwich

2 Who would you like to go fishing with?

I would like to go with my father

3 What would her children like to do in summer?

They would like to swim inpool

4 When would Mrs Tam like to go shopping?

She would like to go shopping on the weekends

5 Where would Tung and Hung like to study ?

THey would like to study in the school library

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