Cùng lúc từ 2 vị trí A B

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest inmeaning to each of the following question.

I got the impression that the boys were not enjoying themselves.

A. The boys impressed me that they were not enjoying themselves

B. The boys didn’t seem to be enjoying themselves

C. The boys seemed not to enjoying themselves

D. It seemed to me the boys were enjoying themselves

a) Xét ∆ABC có AC < AB (gt)

∠B1 < ∠C1 (1) (Quan hệ cạnh – góc đối diện trong tam giác)

Xét ∆ABD có AB = BD (gt) ∆ABD cân

⇒ ∠A1 = ∠D1 (t/c tg cân)

Mà ∠B1 = ∠A1 + D (Góc ngoài tam giác)

⇒∠D = ∠A1 = ∠B1 /2 (2) Chứng minh tương tự ta có: ∠E = ∠C1 /2 (3) Từ (1),(2),(3) suy ra: ∠ADC < ∠AEB

b) Xét ∆ADE có ∠D < ∠E (Chứng minh câu a)

⇒ AE < AD (Quan hệ giữa cạnh và góc đối diện trong tam giác)

a) Ta có: M(x) = 5x3 + 2x4 – x2 + 3x2 – x3 – x4 + 1 – 4x3 = x4 + 2x2 + 1 b) Ta có (M1) = 14 + 2.12 + 1 = 1 + 2 + 1 = 4 và (M-1) = (-1)4 + 2.(-1)2 + 1 + 1 + 2 + 1 = 4 c) Ta có M(x) = x4 + 2x2 + 1 = (x2+1)2 Nhận xét: Vì x2 ≥ 0 => x2 + 1 > 1 => (x2 + 1)2 > 1 > 0 với mọi x ∈ R Vậy M(x) = (x2 +1)2 > 0 với mọi x ∈ R. Điều này chứng tỏ rằng M(x) không có nghiệm trong R.
Bạn ơi phần nào có số đằng sau x là mũ nhé! ko biết ấn dấu mũ

Read the following text then answer the questions that followed by circling its corresponding letter marked A, B, C or D from 43 to 50.

Since water is the basis of life, composing the greater part of the tissues of all living things, the crucial problem of desert animals is to survive in a world where sources of flowing water are rare. And since man’s inexorable necessity is to absorb large quantities of water at frequent intervals, he can scarcely comprehend that many creatures of the desert pass their entire lives without a single drop. Uncompromising as it is, the desert has not a limited life but only those forms unable to withstand its desiccating effects. No moist skinned, water-loving animals can exist there. Few large animals are found. The giants of the North American desert are the deer, the coyote, and the bobcat. Since desert country is open, it holds more swift-footed running and leaping creatures than the tangled forest. Its population is largely nocturnal, silent, filled with reticence, and ruled by stealth. Yet they are not emaciated. Having adapted to their austere environment, they are as healthy as animals anywhere else in the world. The secret of their adjustment lies in the combination of behavior and physiology.

None could survive, like mad dogs and Englishmen, if they went out in the midday sun, many would die in a matter of minutes. So most of them pass the burning hours asleep in cool, humid burrows underneath the ground, emerging to hunt only by night. The surface of the sun-baked desert averages around 150 degrees, but 18 inches down the temperature is only 60 degrees.

The word “emaciated” in the passage mostly means ________.

A. “thin and weak because of lack of food and water”

B. “living or growing in natural conditions, not kept in a house or on a farm”

C. “large and strong, difficult to control or deal with”

D. “able to get what one wants in a clever way, especially by tricking or cheating”

Vì sao dưới bóng cây mát hơn dưới mái che bằng vật liệu xây dựng?

Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.

The boy next door fell off his bike yesterday but he was all right. He_______himself badly.

A. should have hurt

B. would hurt

C. could have hurt

D. must hurt

\(1^1\) = \(1^2\)= \(1^3 \) =...= \(1^9\)= 1

\(1^0 =2^0=3^0 =...= 9^0=1\)