Tìm hệ số của x 7 trong khai triển biểu thức sau:  h ( x ) = x ( 2 + 3 x ) 9

A. 489889

B. 489887

C. -489888

D. 489888

Read the passage below carefully, and then choose the best answer

MANY KINDS OF MICROBES

There are thousands of different kinds of microbes. Microbes called (1) _______ are the smallest living things. Bacteria live almost everywhere: on land, in water, and even (2) _______ you.

Some microscopic life forms are like plants. Tiny diatoms are microbes that live in lakes and the ocean. Diatoms soak up (3) _______ and use its energy to make food, just like plants.

Some microscopic life forms are more (4) _______ animals. Protozoa such as the amoeba and paramecium are animal-like microorganisms. An amoeba can move (5) _______ changing the shape of its body. It sticks out a pseudo pod, or false foot. A paramecium is (6) _______ with tiny hairs. It waves its hairs rapidly to swim.

Viruses are (7) _______ kind of microbe. Viruses sometimes act like living things and other times act like nonliving things. Viruses sometimes live in the cells of plants and animals. (8) _______ a cell, a virus reproduces like a living thing. The virus uses the cell to make many copies of itself. Viruses are (9) _______ small to see with an ordinary microscope. You need a powerful electron microscope to see a virus. Outside of a plant or animal cell, a (10) _______ is like a nonliving thing.

Question 30:

A. by

B. after

C. befor

D. during

Mất dạy chấp lm gj?

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Trong khai triển x − y 11 , hệ số của số hạng chứa x 8 . y 3  là

A.  C 11 3

B.  - C 11 3

C.  - C 11 5

D.  C 11 8

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