Tính giá trị bt sau:

\(A=sin^225^o+sin^265^o-tan35^o+cot55^o-\frac{cot32^o}{tan58^o}\)

cho A = \(\frac{1}{2\sqrt{x}-2}-\frac{1}{2\sqrt{x}+2}=\frac{\sqrt{x}}{1-x}\)

a) tìm TXĐ và rút gọn biểu thức A

b) tính giá trị của A tại \(x=9-4\sqrt{5}\)

c) tìm GTNN của biểu thức M = \(-\left(x+15\right).A\)

\(\sqrt{6+2\sqrt{5}}+\sqrt{6-2\sqrt{5}}\)

chuyển chủ động sang bị động

Câu 1: The waiter refilled my glass.

Câu 2: My secretary will notify you next week.

Câu 3: Is a student pilot flying that airplane?

Câu 4: Alan’s knowledge about art dosen’t impress me.

Câu 5: People throw away billions of cans every year all over the world.

Câu 6: D.E Hughes invented microphone in 1878.

Câu 7: Do people speak Spanish in Brazil?

Câu 8: Someone will list my name in the new telephone directory.

Câu 9: A plumper is going to fix the leaky faucet.

Câu 10: Someone has changed the name of this street.

Câu 11: Elias Howe invented the sewing machine in 1845.

Câu 12: The librarian didn’t allow Tom to take those books home.

Câu 13: The teachers won’t teach knownledge on recycling tomorrow.

Câu 14: Hoi An attracts a lot of tourists.

Câu 15: Did all students attend first-aid course last year?

Câu 16: Farmer can milk cows twice a day.

Câu 17: The nurse taught Hoa how to give first-aid on the phone.

Câu 18: When I came,he was repairing the computer.

Câu 19: We will grow a lof of trees in the parks.

Câu 20: They are painting the living room light blue.

Câu 21: People have developed many different paper products.

Câu 22: He asked us many difficult questions.

Câu 23: They must widen the road soon.

Câu 24: She advised me to reuse milk bottles.

Câu 25: My sister cleans these room every day.

Câu 26: Wastes have caused a lof of pollution.

Câu 27: When dose he usually do his homework?

Câu 28: My father planted this tree.

Câu 29: He hasn’t collected the rubbish.

Câu 30: Are people using recycled paper?

Câu 31: They made us work hard every day.

Câu 32: How can we keep our fields in good condition?

Câu 33: John used to ask his father a lof of question when he was a child.

Câu 34: He said he would return the book next week.

Câu 35: No one helped him do his homework.

Câu 36: They say I am very intelligent.

Câu 37: Turn off all the switches before leaving the workshop.

Câu 38: Who wrote this poem?

Câu 39: She threw everything she had to me.

change these following sentences into passtive voice.

1. The students have discussed the pollution problems since last week.

2. Some people will interview the new president on TV.

3. How many languages do they speak in Canada?

4. Are you going to repair those shoes?

1. our beautiful forests (destroy)...................... if we do nothing to preserve them.

2. Don't ring me between 8 and 9 tomorrow. I (have)...................... a very important meeting then.

3. It's high time something (do).................... to prevent traffic jams in big cities.

1. Preserving natural resources mean reserving them for our future.

A B C D

2. No sooner had I reached the central city than it rained vrey hardly.

A B C D

1. It might be a good idea to use honey instead of sugar.

=> Why.......................................

2. Jim used to swim more skillfully than he does now

=> Jim doen't............................................

điềm thêm từ để câu hoàn chỉnh

1.breathing/pollute/air every day/lead/respiratory problem

2. the next bus/ Da Nang city/ leave/ 8 pm/platform two

giải phương trình:

\(\frac{5}{3-x}+\frac{7}{2+x}=0\)