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truy bài 25/10 chiều

Authored by Dung Cao Thị Thùy

Mathematics, English, Physics

1st Grade

truy bài 25/10 chiều
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15 questions

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1.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Kết quả -5x3.(5x2 +2x -3) bằng:

A. 25x5 – 10x4 -15x3

B. -25x5 – 10x4 +15x3

C. -25x5 + 10x4 +15x3

D. Tất cả đều sai

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

3.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Khai triển 4x2 – 25y2 theo hằng đẳng thức ta được

(4x – 5y)(4x + 5y)

(4x – 25y)(4x + 25y)

(2x – 5y)(2x + 5y)

(2x – 5y)2

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Tích (2x – 3)(2x + 3) có kết quả bằng

4x2 + 12x+ 9 

4x2 – 9 

2x2 – 3

4x2 + 9

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Chọn câu đúng. (x – 2y)3 bằng

x3 – 3xy + 3x2y + y3  

x3 – 6x2y + 12xy2 – 8y3

x3 – 6x2y + 12xy2 – 4y3

x3 – 3x2y + 12xy2 – 8y3

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