cm a+b+\(\dfrac{1}{2}\ge\sqrt{a}+\sqrt{b}\)

\(\dfrac{\sqrt{a}+a\sqrt{b}-\sqrt{b}-b\sqrt{a}}{ab-1}\)

\(\dfrac{1}{\sqrt{2}+\sqrt{2+\sqrt{3}}}+\dfrac{1}{\sqrt{2}-\sqrt{2-\sqrt{3}}}\)

Số 60 gấp mấy lần số 6?

A. Television is a tool to gain education and information.

B. Television is a tool gaining education and information.

C. Television are a tool to gain education and information.

D. Television are a tool gaining education and information.

Error Identification

As they grow older, children in many cultures taught not to rely on their parents.

A. grow older

B. taught

C. not to rely

D. on their parents

Mark the letter A, B, C, or D on your answer sheet to indicate the sentence that is CLOSEST in meaning to each of the following questions.

When I picked up my book, I found that the cover had been torn.

A. The cover had been torn when my book picked up.

B. On picking up the book, I saw that the cover had been torn.

C. Pick up my book, the cover had been torn.

D. Picked up, I saw that the cover of the book was torn.

Điền dấu ( > ; < ;  = ) thích hợp vào ô trống:

75 88   . . .   73 91

Trong không gian với hệ tọa độ Oxyz, cho mặt cầu (S): ( x - 1 ) 2 + ( y + 2 ) 2 + z 2 = 9  Tâm I và bán kính R của (S) lần lượt là

A. I(1;-2;0);R=3

B. I(-1;2;0);R=3

C. I(1;-2;0);R=9

D. I(-1;2;0);R=9