Điền dấu >, <,  vào ô trống

7 5 . . . . 1 9 11 . . . . 1 9 4 . . . . . 8 4 15 9 . . . . 5 3

Trong không gian với hệ trục tọa độ Oxyz, cho mặt cầu  S : x + 2 2 + y − 3 2 + z − 1 2 = 16 . Tìm tọa độ tâm I và tính bán kính R mặt cầu (S).

A. I 2 ; − 3 ; − 1 và R=16

B. I − 2 ; 3 ; 1 và R=4

C. I − 2 ; 3 ; 1 và R=16

D. I 2 ; − 3 ; − 1 và R=4

Đồ thị hàm số nào dưới đây có tiệm cận ngang ?

A. y =  1 x - 1

B. y =  1 x - x 2

C. y =  x 3 - 3 x 2 + 1 .

D. y =  x 4 - x 2 + 1 .

Theo A-rê-ni-ut, axit là

A. chất khi tan trong nước phân li ra anion H + .

B. chất khi tan trong nước phân li ra cation  H + .

C. chất khi tan trong nước phân li ra anion OH - .

D. Tất cả đều sai.

Số thích hợp để điền vào chỗ chấm:   0 , 22   m 3   =   … … … .   d m 3   là bao nhiêu

A. 22

B. 220

C. 2200

D. 22000

Phương trình đường tròn đi qua ba điểm A(-1; 3), B(1; 0), C(3; 5) là:

A.  x 2 + y 2 - 5 / 8 x - 11 / 4 y + 21 / 8 = 0

B.  x 2 + y 2 - 27 / 8 x - 21 / 4 y + 19 / 8 = 0

C.  x 2 + y 2 - 5 / 6 x - 11 / 6 x - 2 / 3 = 0

D.  x 2 + y 2 - 27 / 8 x - 21 / 4 y - 19 / 8 = 0

Lớp 5B có 32 học sinh, trong đó số học sinh 10 tuổi chiếm 75%, còn lại là học sinh 11 tuổi. Tính số học sinh 11 tuổi của lớp học đó

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

One of the seven wonders of the ancient world, the Great Pyramid of Giza was a monument of wisdom and prophecy built as a tomb for Pharaoh Cheops in 2720 B .C . Despite its antiquity, certain aspects of its construction makes it one of the truly wonders of the world. The thirteen- acre structure near the Nile river is a solid mass of stone blocks covered with limestone. Inside are the number of hidden passageways and the burial chamber of the Pharaoh. It is the largest single structure in the world. The four sides of the pyramid are aligned almost exactly on true north, south, east and west-an incredible engineering feat. The ancient Egyptians were sun worshippers and great astronomers, so computations for the Great Pyramid were based on astronomical observations.

Explorations and detailed examinations of the base of the structure reveal many intersecting lines. Further scientific study indicates that these represent a type of timeline of events – past, present and future. Many of the events have been interpreted and found to coincide with known facts of the past. Others are prophesied for future generations and are currently under investigation. Many believe that pyramids have supernatural powers and this one is no exception. Some researchers even associate it with extraterrestrial beings of ancient past.

Was this superstructure made by ordinary beings, or one built by a race far superior to any known today?

Question: The word ‘feat’ in the first paragraph is closet in meaning to ____.

A. accomplishment

B. festivity

C. appendage

D. structure