\(\dfrac{x-2\sqrt{x}-1}{\left(\sqrt{x}-1\right)\left(\sqrt{x}+1\right)}\)

rút gọn

1,He (repair) the car when his wife cooks dinner late for today

2,What__you and your brother(do)last night after having dinner? - I (watch) a film while my brother(play)computer games

3,Watch out!You(cross)the sreet and there(be)many cars there

4,At 8.30 a m tomorrow, scientists(do)some experments to find out the way dolphin communicate with each other

5,It(take)the Earth 365 days to go around the sun

1, The more___you think, the better you feel

A.negative

B.negatively

C.positive

D.positively

2, ____means communicating by expressing thoughts with words

A.Non-verbal communication

B.Verbal coomunication

C.Body language

D.Sign language

3, He is unhappy because of his___

A.deaf

B.wide

C.deafness

D.width

4, Computers are____used in schools and universities

A. sensitve

B.active

C.talkative

D.interactive

5, She is very___he always cries when watching sad movies

A.attractive

B.creative

C.generous

D.sensitive

a) cho tg abc vg tại a có tan góc b=2.hãy tính các tỉ số lượng giác của góc c b) cho tg abc vg tại a, có sin góc b = căn 3 phần 2. tính các tỉ số lượng giác góc b