Bài 2: Cho:
\(E=\left(\dfrac{\sqrt{x}+1}{\sqrt{x}-1}-\dfrac{\sqrt{x}-1}{\sqrt{x}+1}+4\sqrt{x}\right):\left(\sqrt{x}-\dfrac{1}{\sqrt{x}}\right)\)
a) Tìm x để E xác định
b) Rút gọn E
c) Tìm x để E = 2
d) Tính gtri của E để \(x=\left(4+\sqrt{15}\right)\left(\sqrt{10}-\sqrt{6}\right)\sqrt{4-\sqrt{15}}\)
cho tam giac ABC vuong tai A, M la trung diem cua BC. Goi I la trung diem cua AB, K la diem doi xung voi M qua I.
a) Tu giac AMBK la hinh gi? Vi sao?
b) Tu giac AKMC la hinh gi? Vi sao?
c) Tam giac ABC co dieu kien gi de tu giac AMBK la hinh vuong. Cho BC = 6cm, hay tinh chu vi hinh vuong AMBK
cho tam giac ABC vuong tai A, M la trung diem cua BC. Goi I la trung diem cua AB, K la diem doi xung voi M qua I.
a) Tu giac AMBK la hinh gi? Vi sao?
b) Tu giac AKMC la hinh gi? Vi sao?
c) Tam giac ABC co dieu kien gi de tu giac AMBK la hinh vuong. Cho BC = 6cm, hay tinh chu vi hinh vuong AMBK
Ex1: Complete the conditional sentences, using the given information:
1. You should take exercise regularly because it is the way to get fit.
-> If you ...........................................................................................
2. I can't look the word up because I don't have a dictionary.
-> If I ....................................................................................
3. I don't have his phone number, so I don't phone him.
-> If I ............................................................................
4. You may want a help, just give me a ring.
-> If you .......................................................
5. It is raining, so we won't finish the game.
-> If it ..........................................................
6. I don't ride the bus to school every day because it is always crowded.
-> If the bus ..............................................................................................
7. People don't realise how important it is to conserver energy, so they do nothing about it.
-> If people ............................................................................................................................
8. David has a lot of accidents because he is so clumsy.
-> If David ......................................................................
Ex3: Combine each pair of sentences to make one sentence, using the words given in brackets:
1. Spring comes. Many villages prepare for a new festival season. (when)
2. Lang Lieu couldn't buy any special food. He was very poor. (because)
Ex4: Make meaningful sentences from the given words/ phrases:
1. There/ custom/ of/ decorate/ the house/ special occasions.
Ex3: Make sentences using the given words:
1. The festival/ feature/ many folk games/ bamboo swings/ rice cooking competitions/ lion dance/ human chess/ water puppet performance/ wrestling/ crossbow shooting, ctc.
2. There/ a ceremony/ offering incense/ five-fruit trays/ and specialities/ chung cakes/ day cakes/ which/ two traditional foods/ Vietnam.
3. Governmental leaders/ will lead/ procession/ up/ Upper Temple.
Ex2: Make sentenes about King Hung Temple Festival, using the words and phrases given. You can add some words and make changes:
1. King Hung Temple Festival/ take place/ yearly/ King Hung Temple/ the 8th/ 11th day/ the third lunar month.
2. During the festival/ Vietnamese people/ go/ King Hung Temple/ Nghia Linh Mountain, Phu Tho Province/ take part/ this festival.