tìm GTLN của

M=\(\sqrt{x-1}+\sqrt{9-x}\)

cho hai hàm số bậc nhất y=-2x+5 (d) và y=0,5x (d')

a) vẽ đồ thị (d) và (d') của 2 hàm số đã cho trên cùng 1 hệ tọa độ Oxy

b) tìm tọa độ điểm M là giao điểm của 2 đồ thị vừa vẽ ( bằng phép tính )

c) Tính góc α tạo bởi đường thẳng d với trục hoành Ox ( làm tròn kết quả đến độ)

d) Gọi giao điểm của d với trục Oy là A, tính chu vi và diện tích tam giác MOA

Cho M=\(\dfrac{\sqrt{a}+2}{\sqrt{a}-2}\)

a )Tìm a ∈ Z để M ∈ Z

b) Tìm a ∈ Q để M ∈ Z

Gọi tên công thức sau 

A. Axit 2-hidroxi butan dioic (axit malic).

B. Axit 2,3-dihidroxi butan dioic (axit tactric)

C. Axit 2,3-dihidroxi butanoic

D. Axit 2,2-dihidroxi butan dioic

Đốt cháy hết m gam một axit no, đơn chức, mạch hở được (m + 2,8) gam CO₂ và (m – 2,4) gam H₂O. Công thức phân tử của axit là

A. HCOOH.        

B. CH₃COOH.      

C. C₂H₅COOH.    

D. C₃H₇COOH.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions

A. smoothly

B. southern 

C. breath

D. airworthy 

Cho hình chóp S.ABCD có đáy ABCD là hình bình hành, cạnh bên SA vuông góc với đáy. Biết khoảng cách từA đến mặt phẳng (SBD) bằng 6 a 7 . Khoảng cách từ điểm C đến mặt phẳng (SBD) bằng

A.  3 a 7

B.  4 a 7

C.  6 a 7

D.  12 a 7  

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 from 30 to 37.

     The Arts and Crafts Movement in the United States was responsible for sweeping changes in attitudes toward the decorative arts, then considered the minor or household arts. Its focus on decorative arts helped to induce United States museums and private collectors to begin collecting furniture, glass, ceramics, metalwork, and textiles in the late nineteenth and early twentieth centuries. The fact that artisans, who were looked on as mechanics or skilled workers in the eighteenth century, are frequently considered artists today is directly attributable to the Arts and Crafts Movement of the nineteenth century. The importance now placed on attractive and harmonious home decoration can also be traced to this period, when Victorian interior arrangements were revised to admit greater light and more freely flowing spaces.

     The Arts and Crafts Movement reacts against mechanized processes that threatened handcrafts and resulted in cheapened, monotonous merchandise. Founded in the late nineteenth century by British social critics John Ruskin and William Morris, the movement revered craft as a form of art. In a rapidly industrializing society, most Victorians agreed that art was an essential moral ingredient in the home environment, and in many middle- and working-class homes craft was the only form of art. Ruskin and his followers criticized not only the degradation of artisans reduced to machine operators, but also the impending loss of daily contact with handcrafted objects, fashioned with pride, integrity, and attention to beauty.

     In the United States as well as in Great Britain, reformers extolled the virtues of handcrafted objects: simple, straightforward design; solid materials of good quality; and sound, enduring construction techniques. These criteria were interpreted in a variety of styles, ranging from rational and geometric to romantic or naturalistic. Whether abstract, stylized, or realistically treated, the consistent theme in virtually all Arts and Crafts design is nature.

     The Arts and Crafts Movement was much more than a particular style; it was a philosophy of domestic life. Proponents believed that if simple design, high-quality materials, and honest construction were realized in the home and its appointments, then the occupants would enjoy moral and therapeutic effects. For both artisan and consumer, the Arts and Crafts doctrine was seen as a magical force against the undesirable effects of industrialization.

The word “extolled” in the third paragraph is closest in meaning to ________.

A. exposed

B. praised 

C. believed 

D. accepted