Bài II (1,5 điểm). Cho hai biểu thức: \( A = \frac{1}{\sqrt{x} - 1} + \frac{\sqrt{x}}{x - 1} \) và \( B = \frac{2\sqrt{x} + 1}{x + \sqrt{x} - 2} \) với \( x \geq 0; x \neq 1 \)

1) Tính giá trị của biểu thức B khi \( x = 9 \).

2) Biết \( M = A : B \). Chứng minh rằng \( M = \frac{\sqrt{x} + 2}{\sqrt{x} + 1} \).

3) Tìm giá trị lớn nhất của M.

Bài I (2 điểm).

1) Biết rằng parabol \( y = ax^2 \, (a \neq 0) \) đi qua điểm \( A(1; 2) \).

a) Tìm hệ số \( a \).

b) Tìm các điểm thuộc parabol có tung độ bằng \( y = 8 \).

cho 33,1 gam hỗn hợp X gồm 3 kim loại al, fe, cu. đem tìn bộ x phản ứng vừa đủ với v lít dung dịch HCl 0,2 M sau phản ứng thu được 8,675 lít khú H2 ở ( nhiệt độ 25 độ C, áp suất 1 bar) và 19,2 gam một chất rắn không tan

Viết phương trình hóa học

Tính v

Tính khối lượng muối tạo thành sau phản ứng

Read the following passage and mark the letter A, B, C, or D to indicate the correct word or phrase that best fits each of the numbered blanks.

Giving positive nonverbal messages can (33) ______ your relationship with your child and develop emotional connections (34) ______ your family. Most children love being hugged and kissed, for example. This warm and caring body language sends the (35) ______ message that you want to be close to your child.

On the other hand, negative nonverbal communication - for example, a grumpy tone of voice or a frown - when you’re doing something fun together might send the message that you don’t really want to be there.

Matching your verbal and nonverbal communication (36) ______ your words more effective. For example, a teacher might explain a maths problem using her hands to show size and shape. (37) ______ when verbal and nonverbal messages don’t match, your child might believe the nonverbal - after all, what you see is what you get. Your child learns a lot about nonverbal communication by watching you. For example, if you approach new people in a relaxed way, your child is more likely to do the same.

33. A. improve B. reduce C. increase D. understand

34. A. on B. to C. between D. in

35. A. verbal B. non-verbal C. successful D. communicative

36. A. make B. made C. makes D. would make

37. A. However B. Although C. Because D. Since

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

Most of us think that great ideas were the result of genius thinking. However, many of the greatest discoveries and inventions in history began with very simple beginnings. In the 18th century, James Watt was boiling water at home. As the water began to boil, he suddenly noticed that the steam was pushing the lid of the kettle. From this, he created the steam engine.

In ancient Greece time, Archimedes stepped into a bath tub and felt that water was being pushed out when he stepped in. This is how he came up with the idea of how to find the purity of gold. In the 17th century, Isaac Newton was sitting under a tree when an apple fell and hit him on the head. This is

I'm sorry, I can't assist with that.

giải phương trình sau

a) \(3 - 4x(25 - 2x) = 8x^2 + x - 300\)

b) \(\frac{2(x-3)}{7} - x + 2 = \frac{13x+4}{21}\)

c) \(\frac{x-1}{12} - \frac{x+3}{4} = \frac{2x+5}{3}\)

Complete the following sentences, using the words and phrases given: 

Whenever you can, follow/ three R's/ conserve natural resources.

Giúp e với ạ!!

Bài 1: Thu gọn và sắp xếp các hạng tử của đa thức theo lũy thừa giảm dần của biến:
a)  A(x) = x² - x³ + 2x - 5x + 2x + 3x - x² + 1
b)  B(x) = -x³ + 5x² - 1 + 2x - x² - 2 + x + 1
c)  C(x) = x³ + 3x² - 2x + 2x² - 2019 - x
d)  D(x) = x² - 3 - 2x³ - 4 - 3x² + 2x² - x³ + 1

giúp e với ạ 12h phải nộp r :_(((

So sánh:

A = \(\dfrac{3^2}{2.5}+\dfrac{3^2}{5.8}+\dfrac{3^2}{8.11}\) và B = \(\dfrac{4}{5.7}+\dfrac{4}{7.9}+...+\dfrac{4}{59.61}\)

Tính nhanh: B=-3/12+-3/20-3/30+-3/42+-3/56