cho bthuc P=1: (\(\dfrac{1}{2+\sqrt{x}}+\dfrac{\dfrac{3x}{2}}{4-x}-\dfrac{2}{4-2\sqrt{x}}\)):\(\dfrac{1}{4-2\sqrt{x}}\)

a)rút gọn P

b)tìm gtri của x để P=20

cho biểu thức P: 1+(\(\dfrac{2a+\sqrt{a}-1}{1-a}-\dfrac{2a\sqrt{a}-\sqrt{a}+a}{1-a\sqrt{a}}\))x\(\dfrac{a-\sqrt{a}}{2\sqrt{a}-1}\)

a)cho P=\(\dfrac{\sqrt{6}}{1+\sqrt{6}}\) tìm gtri của a

b)cmr P>\(\dfrac{2}{3}\)

Good maner are a treasure to the people who possess them as well as to the community they live in.Manners are taught,learnt,and passed from generation to generation.

even hundreds of years ago,children were taught to behave responsibly.They learnt to respect seniority.When they passed an object to another person,they had to use both hands.When they entered a room,they had to bow and greet the oldest person first.Boys learn to work hard to support their families.Girls learnt to do housework,and to take care of others.Loyalty and honesty were highly appreciated.When they made a mistake,they would not let another person be punished for it.That would be cowardly and mean.They were taught that families were strong,and everybody should stick together in adversity.

Fortunately,many ofthese values have been well preserved.They have contributed to making the unique Vietnamese culture,and strengthening our society

1.How were children taught to behave hundred years ago?

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2.Who/What dose the word "they" (line 3) refer to?

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3.Is "cowardly and mean" (line 7) used to describe good or unacceptable behavior?

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4.What values were highly appreciated?

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Some people believe that skyscrapers are a..................of big cities.

A.center B.street C.feature D.resident

Many employers considers computer skills to be more important than work experience

->It is.............................................................................................................................

Cho hàm số bậc nhất y=(2m-1)x+3 có đồ thị là (d) a)tìm m để đoạn thẳng y=x+3 và y=2x +1 đồng quy b)gọi 2 điểm A và B là giao điểm của (d) lần lượt trục Ox,Oy.tìm m để diện tích tam giác OAB=3

cho nửa đường tròn(O;R)đường kính AB,vẽ 2 tiếp tuyến Ax lấy điểm E(E#A,AE<R).Trên nửa đường tròn lấy điểm M sao cho EM=EA, đường trò EM cắt tia By tại F. a)CM: EF là tiếp tuyến của (O) b)CM: tam giac EOF là tam giác vuông c)CM:AM*OE+BM*OF=AB*EF