5A

1B

3C

4D

\(#TyHM\)

C

1 Unless there is a sudden change in public opinion, he will win the next election

a: \(S=\dfrac{4\cdot6}{2}=12\left(cm^2\right)\)

b: Độ dài hai đường chéo là 8;6

Cạnh là 5cm

\(\left\{{}\begin{matrix}\left(x+2\right)^2+\left(y-1\right)^2=x^2+y^2+7\left(1\right)\\\left(x+1\right)\left(y+2\right)=xy+5\left(2\right)\end{matrix}\right.\)

\(\left(2\right)\Leftrightarrow xy+2x+y+2=xy+5\Leftrightarrow2x+y+2=5\)

\(\Leftrightarrow y=3-2x\left(3\right)\)

\(\left(3\right)\left(1\right)\Rightarrow\left(x+2\right)^2+\left(2-2x\right)^2=x^2+\left(3-2x\right)^2+7\Rightarrow x=y=1\)

\(\left\{{}\begin{matrix}\dfrac{1}{x}+\dfrac{1}{y}=\dfrac{3}{4}\\\dfrac{1}{6x}+\dfrac{1}{5y}=\dfrac{2}{15}\end{matrix}\right.\)\(\left(x,y\ne0\right)\) \(đặt\left\{{}\begin{matrix}\dfrac{1}{x}=a\\\dfrac{1}{y}=b\end{matrix}\right.\)\(\Rightarrow\left\{{}\begin{matrix}a+b=\dfrac{3}{4}\\\dfrac{1}{6}a+\dfrac{1}{5}b=\dfrac{2}{15}\end{matrix}\right.\)

\(\Leftrightarrow\left\{{}\begin{matrix}a=\dfrac{1}{2}\\b=\dfrac{1}{4}\end{matrix}\right.\)\(\Leftrightarrow\left\{{}\begin{matrix}x=2\\y=4\end{matrix}\right.\)\(\left(tm\right)\)

https://coccoc.com/search/math#query=3(1-4x).(x-1)%2B4.(3x-2).(x%2B2)%2Bx2+%3D52++T%C3%ACm+x+

(3-12x)(x-1)+(12x-8)(x+2)+x²=52

3(x-1)-12x(x-1)+12x(x+2)-8(x+2)+x²=52

3x-3-12x²+12+12x²+24x-8x-16+x²=52

(3x+24x-8x)+(12-3-16)+(12x²-12x²+x²)=52

19x-7+x²=52

x(19-x)=52+7=59

mà 59 là số ng tố nên x rỗng

Vậy x E \(\theta\)

đang thi mik ko giúp đc, xin lỗi nha

Bh bạn thi xong vậy ạ 

Lỗi rùi, cập nhật lại nha

Lỗi

"Hello teacher, my name is [Tên của bạn]. I’m 16 years old and I’m currently a student in class 10[Tên lớp] at [Tên trường] High School. In my free time, I really enjoy reading books and playing sports because they help me relax after school. Today, I’m going to talk about my chosen topic."

"Nowadays, the environment is facing many serious problems, and I think we can help by taking some simple steps. First, we should reduce waste by using reusable bags instead of plastic ones. Second, it is important to save energy; we should turn off all lights and fans before leaving the room. Finally, we can plant more trees or join clean-up activities in our neighborhood. I believe that small actions can make a big change for our planet."

"Ecotourism is a great way to travel and protect nature at the same time. To be a good ecotourist, first, we should respect the environment by not littering and staying on the designated paths. Second, we should support local people by buying their handmade products or eating at local restaurants. Lastly, we need to save water and electricity even when we are on vacation. By doing these things, we can enjoy our trip while preserving nature for the future."

"Blended learning, which combines face-to-face and online learning, has many benefits. First, it offers flexibility because students can watch lessons and do homework at their own pace. Second, it provides diverse resources, such as educational videos and online quizzes, which make learning more fun. Finally, it helps us improve our IT skills, which are very important in the modern world. In short, blended learning makes education more effective and interesting."