Cho pt ; x² - \((2m+1)\)x +m² +m-6=0 \((\) *\()\)

a, Tìm m để pt [*] có 2 nghiệm âm

b, Tìm m để pt [*] có 2 nghiệm x₁ , x₂ thỏa mãn \(|\) x₁³ -x₂³ \(|\) =50

Cho đt [o] và đường thẳng [d] , đường kính AB của đt vuông góc vs đt[d] tại H [ B ở giữa O và H ] , M là 1 điểm bất kì trên đường tròn ko trùng vs A , B. Các đt AM,BM và tiếp tuyến tại M của đường tròn cắt đt [d] lần lượt tại D,C,I . AC cắt đtròn tại E

a, CM ; AMHC nội tiếp

b, cm; \(\Delta\) ICM cân

c, cm; AM,EB,CH luôn cắt nhau tại 1 điểm

Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word for each of the blanks from 46 to 50.

Our Homes: Now and Then

Everyone needs a home where they feel sheltered and safe. Today we live in modern flats and houses, (46) x have air-conditioning to keep us cool, and heating to keep us warm. There is electricity for lighting and supplies of gas or oil for the heating. Hot and cold water (47) x from the taps and dirty water disappears (48) x the drains. Many of our homes have balconies or gardens. In the past, people made their homes from materials that they found nearby. When we look at different houses we can tell how old they are from the materials used and the way they were built.

It was different long (49) x people did not have water in their homes and there were no electric lights. T keep warm they sometimes made (50) x inside their homes. With a fire started they could cook their food and heat water.

Điền vào ô 48

A. up

B. towards

C. on

D. down

Mark the letter A, B, C or D on your answer sheet to indicate the sentence that is closest in meaning to each of the following questions.

"It can’t be Mike who leaked the document, it might be Tom.” said our manager.

A. Our manager suspected Tom of having leaked the document, not Mike. 

B. Our manager showed his uncertainty about who leaked the document: Mike or Tom. 

C. Our manager blamed Tom for having leaked the document instead of Mike. 

D. Our manager made it clear that Tom was the one who leaked the document, not Mike.

Một hạt nhân  phóng xạ α, β-, β+, γ hãy hoàn chỉnh bảng sau:

Mark the letter A, B, c or D on your answer sheed to indicate the sentence that is closest in meaning to each of the following questions.
Workers are expected to dress appropriately, as described in the company rules, while on the premises

A.  Employees need to wear then official uniforms only when in company-owned buildings.

B.  When at the workplace, employees must wear clothing in accordance with company regulations.

C.  It is preferred that workers wear best clothes when they vistit the office.

D. It is better if workers put on their uniforms before they get to work , as this is more appropriate.

Nhận xét về hậu quả của các cuộc chiến tranh, xung đột trong khu vực Tây Nam Á đối với sự phát triển kinh tế - xã hội và môi trường ?

Vì ptđt qua A\((1;3)\) \(\Rightarrow\) a.1+b=3 \((1)\)

qua B \((3;2)\) \(\Rightarrow\) a.3+b=2 \((2)\)

từ \((1)\) và \((2)\) ta có hệ \(\left\{{}\begin{matrix}a+b=3\\3a+b=2\end{matrix}\right.\) \(\Leftrightarrow\) \(\left\{{}\begin{matrix}-2a=1\\3a+b=2\end{matrix}\right.\) \(\Leftrightarrow\) \(\left\{{}\begin{matrix}a=\dfrac{-1}{2}\\b=\dfrac{7}{2}\end{matrix}\right.\)

\(\Rightarrow\) ptđt là y= \(\dfrac{-1}{2}\)x + \(\dfrac{7}{2}\)

So sánh 5 và ∛123