Khoảng đồng biến của hàm số $$y=x^2-4x+3$$ là:

D. $$\left(2;+\infty\right)$$ .

B. $$\left(-\infty;2\right)$$ .

C. $$\left(-2;+\infty\right)$$ .

Tập nghiệm S của bất phương trình $$x^2-x-6\le0$$

A. $$\left(-\infty;-3\right)\cup\left(2;+\infty\right)$$

D. $$\left(-\infty;-3\right]\cup\left[2;+\infty\right)$$

Tìm tập nghiệm S của bất phương trình $$x^2-4x+4>0$$

A. S = ℝ∖ $$\left\{2\right\}$$

C. $$S=\left(2;+\infty\right)$$ .

D. S = ℝ∖ $$\left\{-2\right\}$$

Trong mặt phẳng $$Oxy$$ , đường thẳng $$\left(d\right):\ ax+by+c=0,\ \left(a^2+b^2\ne0\right)$$ . Vectơ nào sau đây là một vectơ pháp tuyến của đường thẳng $$\left(d\right)$$ ?

D. $$\overrightarrow{n}=\left(a;b\right)$$

A. $$\overrightarrow{n}=\left(a;-b\right)$$

B. $$\overrightarrow{n}=\left(b;a\right)$$ .

C. $$\overrightarrow{n}=\left(b;-a\right)$$ .

Câu 16: Tọa độ giao điểm của $$\left(P\right):\ y=x^2-4x$$ với đường thẳng $$y=-x-2$$ là

D. $$M\left(1;-3\right),\ N\left(2;-4\right)$$

A. $$M\left(0;-2\right),\ N\left(2;-4\right)$$

B. $$M\left(-1;-1\right),\ N\left(-2;0\right)$$

C. $$M\left(-3;1\right),\ N\left(3;-5\right)$$

Câu hỏi Toán học

Quiz

•

Mathematics

•

12th Grade

•

Practice Problem

•

Hard

Anh Chu

Used 4+ times

FREE Resource

16 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Câu 1: Trong các hàm số sau, hàm số nào nghịch biến trên ℝ?

2.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

D. Không xác định.

3.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

4.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

5.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

6.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

7.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

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