Tính

a) \(\frac{x^2}{\left(x-y\right)\left(x-z\right)}\) +\(\frac{y^2}{\left(y-x\right)\left(y-z\right)}\) +\(\frac{z^2}{\left(z-x\right)\left(x-y\right)}\)

b) \(\frac{1}{\left(a-b\right)\left(b-c\right)}\) + \(\frac{1}{\left(b-c\right)\left(c-a\right)}\) + \(\frac{1}{\left(c-a\right)\left(a-b\right)}\)

c) \(\frac{1}{x^2+x}\) + \(\frac{1}{x^2+3x+2}+\frac{1}{x^2+7x+12}+\frac{1}{x^2+9x+20}+\frac{1}{x+5}\)

tại sao sông Hằng có chế độ nước phát triển hơn sông Ấn

Tại sao Xiêm thoát khỏi tình trạng là nước thuộc địa

Complete the sentences with possessive adjective or possessive pronoun

1.Is this teddy (you)___________? - No, it's (she)___________

2. This is (he)___________hat. That one is (she)___________

3. This is (they)___________goat. The goat ate (it) ___________food

Give the correct tense or form of the verbs in brackets to complete the following sentences.

Let's wait a little. The teacher(come)____________soon

Reoder the words to make correct sentences

1.won't/forgiven/be/He/his/apology./despite

2.all/the/the/In spite/difficulties,/of/project/on/and/time/was/started/a success.

3.we/warned/Although/doing/were/ahead/so,/we/went/with/the/project./against

4.his/of/experiance,/he/In spite/successful/lack/of/a/businessman./became

5.three/being/scored/by far/the/Despite/player,/he/oldest/goals

6.he/is/a/second/Though/millionaire,/he/a/hand/car./drives

7.for/the/never/working/to/for/now,/he/seems/six/months/to/company/know/Despite/what/do

8.though/was/Even/he/of/the/risks,/travel/decide/to/warned/alone/Andrew/to/SouthAmerica

9.did/get/a/in spite/promotion/of/her/not/Maria/qualifications.

10.we/are/Although/company,/we/machines/small/sell/a/hundred/almost/a/month

Rewite the sentences without changing the meaning, beginning as available

1. I thought her new idea was absolutely fascinating

-> I was

2. The journey was exhausting! Twelve hours by bus

-> We were

3. He found the spider frightening

->He was

4. I was really embarrassed when I fell over in the street

->It was

5. My sister is so excited because she is going on holiday tomorrow

-> My sister finds

6. I hate long flights, I'm always really bored

-> The long

7. She looked very confused when I told her we had to change the plane

-> That

8. I think that those spiders are fightening

-> I am

9. It is so frustrating. No matter how much study, I can't remember this vocabulary

-> I feel

10. Is there something xciting to you?

-> Are you

Complete the sentences with available words(There are four redundant words)

1. He work very hard. It's not__________________that he's always tired

2. The teacher's explanation was__________________. Most of students didn't understand it

3. I seldom visit art galleries. I'm not particularly__________________in art

4. The lecture was__________________I fell asleep

5. I asked Emily if she wanted to come out with us but she wasn't__________________

6. I've been working very hard all day and now I'm__________________

7. The children were__________________by three clowns

8. Tom is very good at telling funny stories. He can be very__________________

9. I've got nothing to do. I'm__________________

10. Liz is a very__________________person. She knows a lot, she's travelled a lot and she's done lots of different things

Decide if each sentence is right or wrong and corrct the wrong sentences

1. It was a terrible film and I was bored from start to finish

2. I'm very exciting because I'm going to Florida tomorrow

3. Are you surprised or were you expected her news?

4. Lisa is reading a very intersted book at the moment

5. I've had a very tiring day at work today and I want to go the bed

6. Most people were surprising that she won the prize

7. I'm boring. Let's go out for drink somewhere

8. Visit our excited new shop!

9. His speech wasvery long and very boring

10. Jerry was totally convinced by Alice's explanation