1. Bà bị mộng năng
2. 25 con
3. Tại vì sư tử không biết nấu ăn
4. Quan tài
5. Hoa hậu

trả lời nha 

bằng lồn

1. Bằng mồm

2. bà đi tàu ngầm

3. Hổ chết là hết chỗ

4. CẤM ĐĂNG LINH TINH

5. HẾT

1. If it hadn't been for the awful weather, we wouldn't have cancelled our picnic.

2.1. In order to catch the train, he ran to the station

2.2. He ran to the station so as to catch the train.

3. So as to listen to the football news, the boy turned the radio.

4. In order not to wake up her baby, mother entered the room quietly.

5. To earn some extra money, he plays the guitar for a small group.

a) \(\sqrt{1-x}=\sqrt[3]{8}\) ( ĐK: \(x\le1\) )

\(\Leftrightarrow\sqrt{1-x}=2\)

\(\Leftrightarrow1-x=4\)

\(\Leftrightarrow x=-3\) ( Thỏa mãn )

b) \(\sqrt{4x^2-12x+9}=x+1\) ( ĐK : \(x\ge-1\) )

\(\Leftrightarrow\sqrt{\left(2x\right)^2-2.2x.3+3^2}=x+1\)

\(\Leftrightarrow\sqrt{\left(2x-3\right)^2}=x+1\)

\(\Leftrightarrow\left|2x-3\right|=x+1\)

\(\Leftrightarrow\orbr{\begin{cases}2x-3=x+1\\3-2x=x+1\end{cases}}\) \(\Leftrightarrow\orbr{\begin{cases}x=4\\x=\frac{2}{3}\end{cases}}\) ( Thỏa mãn )

c) \(x+\sqrt{x}-2=0\) ( ĐK : \(x\ge0\) )

\(\Leftrightarrow\left(\sqrt{x}+2\right)\left(\sqrt{x}-1\right)=0\)

\(\Leftrightarrow\sqrt{x}-1=0\)

\(\Leftrightarrow x=1\) ( Thỏa mãn )

+) ĐKXĐ : \(x\le1\)

 \(\sqrt{1-x}=\sqrt[3]{8}\)

\(\Leftrightarrow\sqrt{1-x}=2\)

\(\Leftrightarrow1-x=4\)

\(\Leftrightarrow x=-3\left(TM\right)\)

+)  \(\sqrt{4x^2-12x+9}=x+1\)

\(\Leftrightarrow\sqrt{\left(2x-3\right)^2}=x+1\)

\(\Leftrightarrow\left|2x-3\right|=x+1\)

\(\Leftrightarrow\orbr{\begin{cases}2x-3=x+1\left(x\ge\frac{3}{2}\right)\\2x-3=-x-1\left(x< \frac{3}{2}\right)\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}2x-x=3+1\\2x+x=3-1\end{cases}}\)

\(\Leftrightarrow\orbr{\begin{cases}x=4\\3x=2\end{cases}\Leftrightarrow\orbr{\begin{cases}x=4\\x=\frac{2}{3}\end{cases}\left(TM\right)}}\)

+) ĐKXĐ : \(x\ge0\)

 \(x+\sqrt{x}-2=0\)

\(\Leftrightarrow\sqrt{x}\left(\sqrt{x}+1\right)=2\)

+) \(\hept{\begin{cases}\sqrt{x}=1\\\sqrt{x}+1=2\end{cases}\Leftrightarrow\hept{\begin{cases}x=1\\x=1\end{cases}\Leftrightarrow}x=1\left(TM\right)}\)

+) \(\hept{\begin{cases}\sqrt{x}=2\\\sqrt{x}+1=1\end{cases}\Leftrightarrow\hept{\begin{cases}x=\sqrt{2}\\x=0\end{cases}}}\left(TM\right)\)

Gọi số cần tìm là ab

Ta có 5 x ab = 3ab

=> 5 x ab = 300 + ab

=> 4 x ab = 300

=> ab = 75

Vậy số cần tim là 375

nhin sai sai kieu gi y so 4 lay o dau ?

thấy mệt

1 : thấy mệt

2 : lưới ( đánh cá )

3 : bóng của mặt trăng ( cơ mà theo vật lý thì nó có thể là bóng của bất cứ vật gì có dạng tròn như vậy )

4 : Môi trường sống

Bài làm:

1) \(3\sqrt{12}-4\sqrt{27}+5\sqrt{48}\)

\(=3.2\sqrt{3}-4.3\sqrt{3}+5.4\sqrt{3}\)

\(=6\sqrt{3}-12\sqrt{3}+20\sqrt{3}\)

\(=14\sqrt{3}\)

2) \(\left(\sqrt{45}-2\sqrt{10}+\sqrt{5}\right).\sqrt{5}+5\sqrt{8}\)

\(=3\sqrt{5}.\sqrt{5}-2\sqrt{10}.\sqrt{5}+\sqrt{5}.\sqrt{5}+5.2\sqrt{2}\)

\(=15-10\sqrt{2}+5+10\sqrt{2}\)

\(=20\)

\(2\sin2x-\cos2x=7\sin x+2\cos x-4\)

\(\Rightarrow4\sin x\cos x-\left(1-2\sin^2x\right)-7\sin x-2\cos x+4=0\)

\(\Rightarrow2\cos x\left(2\sin x-1\right)+\left(2\sin^2-7\sin x+3\right)=0\)

\(\Rightarrow2\cos x\left(2\sin x-1\right)+\left(2\sin x-1\right)\left(\sin x-3\right)=0\)

\(\Rightarrow\left(2\sin x-1\right)\left(2\cos x+\sin x-3\right)=0\)

\(\Rightarrow\orbr{\begin{cases}2\sin x-1=0\\2\cos x+\sin x=3,\left(vn\right)\end{cases}\Rightarrow\orbr{\begin{cases}x=\frac{\eta}{6}+k2\eta\\x=\frac{5\eta}{6}+k2\eta\end{cases}}}\)

\(\eta=Pi;3.14159\)

1. This is the first time Khanh went to Japan .

=> Khanh hasn't gone to Japan before .

2. Uyen stared learning 2 weeks ago .

=> Uyen has learnt for 2 weeks .

3. My parents began drinking when it started to rain .

=> My parents have drunk since it started to rain .

4. Tung last had his car repaired when I left him .

=> Tung haven't had his car repaired since I left him.

5. When did she have it ?

=> How long have she had it ?

6. I haven't seen my grandfather for 2 months .

=> The last time I saw my grandfather was 2 months ago .

7. Gin hasn't taken a bath since Tuesday . 

=> It is Tuesday since Gin took a bath .

Học tốt

1) Khanh hasn't gone to Japan before

2) Uyen has learnt English for 2 weeks

3) My parents have drunk since it started rain

4) Tung hasn't repaired his car since the last time I left him

5) How long is it since she have had it ?

6) The last time I saw my grandfather was 2 months ago

7) It is 6 days since the last time Gin took a bath