my favourite food is meat

It's beef
 

Bài làm:

Ta có: \(3^{15}-9^6\)

\(=3^{15}-3^{12}\)

\(=3^{12}\left(3^3-1\right)\)

\(=3^{12}.26=3^{12}.2.13⋮13\)

=> đpcm

không biết nữa

Ta có : x² + 7x + 12 = 0

=> x² + 4x + 3x + 12 = 0

=> x(x + 4) + 3(x + 4) = 0

=> (x + 3)(x + 4) = 0

=> \(\orbr{\begin{cases}x+3=0\\x+4=0\end{cases}}\Rightarrow\hept{\begin{cases}x=-3\\x=-4\end{cases}}\)

Vậy \(x\in\left\{-3;-4\right\}\)

x² + 7x + 12 = 0

<=> x² + 3x + 4x + 12 = 0

<=> x( x + 3 ) + 4( x + 3 ) = 0

<=> ( x + 3 )( x + 4 ) = 0

<=> \(\orbr{\begin{cases}x+3=0\\x+4=0\end{cases}}\Leftrightarrow\orbr{\begin{cases}x=-3\\x=-4\end{cases}}\)

Vậy S = { -3 ; -4 }

Hello everyone, my name is Yen. I am twelve years old. I am from Ngoc Thanh Village, Kim Dong district, Hung Yen province. Today, I am very happy to tell you about my school. My school is Le Quy Don. It is in Luong Bang town, Kim Dong district, Hung Yen province. It is very beautiful and big. There are twelve classrooms and eight function rooms in my shool. My school has five hundred and twenty-five students and thirty-two teachers. Students in my school are very good. They come from around Kim Dong district. Our teachers teach very well. At school, I learn many subject such as : Math, Literature, English, Art, Music,...In Math lessons, I learn how to count. In English classes, I learn how to speak English. In Music lessons, I sing songs. In Art classes, I draw pictures. So on...In all subject, I English best because it's very interesting and important for me. At breaks, I have a lots activities : skipping rope, hiding and seeking, chatting with friends, so on...Each day at school is a happy day. I love my school very much.

Hello everyone. My name is... I am ... years old .I live at ...street,.....district,.......province.Today,I am very glad to introduce my own day to you. My day starts at 5.30 am. When I get up , I'm used to (quen vs vc) doing exercises,brushing teeth,washing my face,... Then, I prepare my breakfast. I usually eat noodles or rice with meat and drink a cup of hot milk. After that, I get on my uniform and walk to school at 6.am. At school ,I study hard for the final grade in the secondary school. If the teacher asks a difficult question, I will ask my friends who can answer it to solve the question together. My class finishes at 11.30am. After finsh the class, I come back home and have lunch and take a rest to 1.30pm. My afternoon class starts at 2pm and finishes at 4.30 pm. When I come home ,I help my parents do the housework. Next, I do my homework before I take a bath. My family often has dinner at 7pm. After the dinner, I watch TV for half an hour and learn by heart the homework . At 12pm, I go to the bed . That is the end my own day.

P/S: mấy chỗ ....... bạn thêm thông tin của mk vào. Còn những chỗ gạch chân bạn có thể thay nó bằng những h/đ của mk.

viết lại 1 a) l 1/2xl =3 - 2x

1.a) ĐK : \(3-2x\ge0\forall x\Rightarrow x\le\frac{3}{2}\)

Khi đó :  \(\left|\frac{1}{2}x\right|=3-2x\Leftrightarrow\orbr{\begin{cases}\frac{1}{2}x=3-2x\\\frac{1}{2}x=-3+2x\end{cases}}\Rightarrow\orbr{\begin{cases}\frac{5}{2}x=3\\\frac{3}{2}x=3\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{6}{5}\\x=2\end{cases}}\left(tm\right)\)

Vậy \(x\in\left\{\frac{6}{5};2\right\}\)

b) ĐK : \(3x+2\ge0\Rightarrow x\ge\frac{-2}{3}\)

Khi đó : \(\left|x-1\right|=3x+2\Leftrightarrow\orbr{\begin{cases}x-1=3x+2\\x-1=-3x-2\end{cases}}\Rightarrow\orbr{\begin{cases}-2x=3\\4x=-1\end{cases}}\Rightarrow\orbr{\begin{cases}x=-1,5\\x=-0,25\left(tm\right)\end{cases}}\)

Vậy x = -0,25

c) ĐKXĐ : \(x-12\ge0\Rightarrow x\ge12\)

Khi đó |5x| = x - 12

<=> \(\orbr{\begin{cases}5x=x-12\\5x=-x+12\end{cases}}\Rightarrow\orbr{\begin{cases}4x=-12\\6x=12\end{cases}}\Rightarrow\orbr{\begin{cases}x=-3\\x=2\end{cases}}\left(\text{loại}\right)\)

Vậy \(x\in\varnothing\)

d) ĐK :  \(5x+1\ge0\Rightarrow x\ge-\frac{1}{5}\)

Khi đó \(\left|17-x\right|=5x+1\Leftrightarrow\orbr{\begin{cases}17-x=5x+1\\17-x=-5x-1\end{cases}}\Rightarrow\orbr{\begin{cases}6x=16\\-4x=18\end{cases}}\Rightarrow\orbr{\begin{cases}x=\frac{8}{3}\left(tm\right)\\x=-4,5\left(\text{loại}\right)\end{cases}}\)

Vậy x = 8/3 

Tóm lại : Cách làm là 

|f(x)| = g(x)

ĐK : g(x) \(\ge0\)

=> \(\orbr{\begin{cases}f\left(x\right)=-g\left(x\right)\\f\left(x\right)=g\left(x\right)\end{cases}}\)

Bạn tự làm tiếp đi ak

 Nếu bớt số BC đi 7 đơn vị thì được số BC mới chia hết cho số chia được thương là 5 tức là Số BC mới gấp 5 lần số chia

Tổng số BC mới và số chia là

55-7=48

Số chia là

48:(1+5)=8

Số BC là

8x5+7=47

a) B

b) C

    a) I . . . . have any ice cream .

A . DO       B . DON'T    C . AND

   b) . . .  you hepl me ?

A . CAN'T    B . DO   C . CAN

Hok tốt !!!!!!!!!!!!!!!

Bài làm:

Ta có: \(P=2x+y+\frac{30}{x}+\frac{5}{y}\)

\(=\left(\frac{30}{x}+\frac{6}{5}x\right)+\left(\frac{5}{y}+\frac{1}{5}y\right)+\left(\frac{4}{5}x+\frac{4}{5}y\right)\)

\(\ge2\sqrt{\frac{30}{x}\cdot\frac{6}{5}x}+2\sqrt{\frac{5}{y}\cdot\frac{1}{5}y}+\frac{4}{5}.10\)

\(=2\cdot6+2\cdot1+8=22\)

Dấu "=" xảy ra khi: \(x=y=5\)

Vậy Min(P) = 22 khi x = y = 5

                                                                             Bài làm

      Hello everybody, my name is Yen. I'm in class 5D at Cao Thuong Primary school. Today, I would to tell you about my best friend. She is Ngoc . She is eleven years old and my classmate. She tall and thin. She has black long hair and round face. She pretty and lovely. Her favourite food is rice and chicken. Her favourite drink is orange juice. In her free time, she often reads book and plays badminton with me. I love her very much. Thanks for read. Good bye !

Hi guys ! My name 's Dant . Iam 10 years old , i'm in class 5a at Hai Ba Trung Secondary school . Today , I would tell you about my best friend . Her name is Yen ,  She is the same age and is in my class . She is fat and tall because she eat too candies and drink too milks . She has short black hair and round face . She is adorable and friendly . Her favourite subject is biological . Her favourite food and drink is fry chicken and Blueberry milk tea.  Yen and me often talk and study English together , those are the great moments . She is always my best friend ! Best friend forever ! Thanks for your following !

#Dant_

D ở chỗ dấu chấm mà mik chưa viết gì nha

Ta có ^BAC + ^ACD = 60+120=180 => AB//CD (2 đt cắt bởi 1 cát tuyến có hai góc trong cùng phí bù nhau thì chúng // với nhau)

Ta có ^DEC = ^C - ^ABD - ^ ACE = 360-120+110=130=^FEC => CD//FE (2 đt bị cắt bởi 1 cát tuyến có hai góc so le trong = nhau thì chúng // với nhau)