giải pt:

\(\left\{{}\begin{matrix}x^3+3y=y^3+3x\\x^2+2y^2=1\end{matrix}\right.\)

giải pt:

x\(^2\)+\(\frac{8x^3}{\sqrt{9-x^2}}\)=9

A=\(\left(\frac{x+\sqrt{x}+1}{x+\sqrt{x}-2}-\frac{1}{1-\sqrt{x}}+\frac{1}{\sqrt{x}+2}\right)\):\(\frac{1}{x-1}\)

a) rút gọn

b) tìm các giá trị của x để \(\frac{1}{A}\)là một số tự nhiên

Cho hệ phương trình \(\left\{{}\begin{matrix}\left(m-1\right)x+y=3m-4\\x+\left(m-1\right)y=m\end{matrix}\right.\)
a/ Giải hệ phương trình khi m= -1

b/ Tìm các giá trị nguyên của m để hpt có nghiệm duy nhất (x;y) mà x;y là các số nguyên

c/ Tìm các giá trị của m để hpt có nghiệm dương duy nhất

cho hai đường thẳng (d1) y= (k-3)x-3k+3 và (d2) y=(2k+1)x+k+5 .Tìm k để

a,(d1) cắt (d2)

b, (d1) cắt (d2) tại một điểm trên trục tung

c,(d1) song song (d2)

d, (d1) vuông (d2)

e,(d1) trùng (d2)

f, (d1) và (d2) cắt nhau tại một điểm trên trục hoành

tìm lỗi sai rồi sửa

1, this is some of advices you should remember

2, I would like some peas and I'd like some carots, either

3, you shouldn't take your clothes to the washing machine since I sniff nasty

4, A nurse told her wait for the doctor

5, It took us three hours for go to airport

6, Westlife played a number of songs, include some of my favourites

1, Jenny can get my car for a week as long as she promises to take care of it

Jenny...

2, They'd like to travel to The Great Walls of China but they are short of money

If they...

3, Try to think of a book you have really enjoyed reading and recommend it to your classmates

If there's an...

4, We didn't go because it rained

If it hadn't...

5, He lost this job because he used to go to work late

If he...

6, Tom doesn't do any morning excercise so he is overweight

If he...

7, My brother didn't leave the car keys so I couldn't pick him up at station

If my brother...

8, We didn't go on holiday because we didn't have enough money

If we...

1, Jenny can get my car for a week as long as she promises to take care of it

\(\rightarrow\)Jenny...

2, They'd like to travel to The Great Walls of China but they are short of money

\(\rightarrow\)If they...

3, Try to think of a book you have really enjoyed reading and recommend it to your classmates

1.we don't go because it will rain

\(\rightarrow\)If it....

2.John is fat because he eats so many chips

\(\rightarrow\)If John...

3.She has a sore throat. She doesn't stop smoking

\(\rightarrow\)If she...

4.They don't find out the remedy. The patient will die

\(\rightarrow\)If they...

5.They don't have enough time so they cannot do me a favour

\(\rightarrow\)If they...

6.The meeting can be cancelled because it snows heavily

\(\rightarrow\)If it...

7.She didn't listen to my directions. That's why she turned down the wrong way

\(\rightarrow\)If she...

8. he didn't have the ticket to game last week. He wasn't be able to get it

\(\rightarrow\)If....

9.He didn't hurry, so he missed the train

\(\rightarrow\)If....

10.He lost this savings because he wasn't careful

\(\rightarrow\)If he...