A

b

A

Chúc bạn thi tốt nha <3

xõa đi. làm mấy đề đơn giản để lấy sự tự tin.

Ko ạ , nhưng thực sự là em rất kém toán và Kt thử toàn 5 ,6 điểm thôi ạ , em lo lắm 

EM lên mang gõ  :fususu-cách học bài  rồi tìm cái phù hợp nha!!!

1 any -> some

2.go -> goes

3. any -> some

4. some -> any

5. I have often -> I often have

1. lỗi: any

sửa: there is some onions.

2. lỗi: in

sửa: Miss Lan always go to the cinema twice a week.

3. lỗi: any

sửa: he needs some meat.

4. lỗi: some

sửa: Do you have any cooking oil?

5. often

sửa: i often have vegetable, fish and meat for dinner.

~~~~~~~~~~~~ ý kiến riêng, chúc bạn học tốt ~~~~~~~~~~~~

1. some-an

2.go-goes

3.any-some

4.some-any

5.have often-often have

Yesterday, when I went to eat with my parent at a restaurant in Hanoi near Guom Lake. I think have eat the most delicuos food in the wolrd. That is spaghetti (an Italian type of noodle). I liked spaghetti because its smell is very good and its taste is good too. I also liked spaghetti because I love noodles and the food came from a country in Europe. When you eat spaghetti you need to eat with plate too because the spaghetti is very long. I wanted to eat again and again spaghetti many times. I thought the world has many of another delicous food, but I still think spaghetti is the best food for me.

Câu hoàn chỉnh, (lược bỏ một số nội dung để ngắn gọn, trôi chảy):

Yesterday, I went to eat with my parent at a restaurant in Hanoi near Guom Lake. I think have eaten the most delicious food in the world. That is spaghetti (an Italian type of noodle). I liked spaghetti because its smell is very good and its taste is good too. I also liked spaghetti because I love noodles and the food came from a country in Europe. You need to eat spaghetti with a plate too because the spaghetti is very long. I wanted to eat again and again spaghetti many times. I thought the world had many other delicious foods, but I still think spaghetti is the best food for me.

I là trọng tâm của ΔABC

=>\(\left\{{}\begin{matrix}x_A+x_B+x_C=3\cdot x_I\\y_A+y_B+y_C=3\cdot y_I\end{matrix}\right.\)

=>\(\left\{{}\begin{matrix}3+\left(-1\right)+x_C=3\cdot1=3\\-1+2+y_C=3\cdot1=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x_C=3-2=1\\y_C=3-1=2\end{matrix}\right.\)

Vậy: C(1;2)

Ta có: A(3;-1); B(-1;2); C(1;2); D(x;y)

=>\(\overrightarrow{AB}=\left(-4;3\right);\overrightarrow{DC}=\left(1-x;2-y\right)\)

ABCD là hình bình hành

=>\(\overrightarrow{AB}=\overrightarrow{DC}\)

=>\(\left\{{}\begin{matrix}1-x=-4\\2-y=3\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=5\\y=-1\end{matrix}\right.\)

Vậy: D(5;-1)

Tâm O của hình bình hành ABCD sẽ là trung điểm của AC

A(3;-1); C(1;2); O(x;y)

=>\(\left\{{}\begin{matrix}x=\dfrac{3+1}{2}=\dfrac{4}{2}=2\\y=\dfrac{-1+2}{2}=\dfrac{1}{2}\end{matrix}\right.\)

Áp dụng công thức trọng tâm:

\(\left\{{}\begin{matrix}x_A+x_B+x_C=3x_I\\y_A+y_B+y_C=3y_I\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x_C=3x_I-\left(x_A+x_B\right)=1\\y_C=3y_I-\left(y_A+y_B\right)=2\end{matrix}\right.\)

\(\Rightarrow C\left(1;2\right)\)

Đặt tọa độ D là \(D\left(x;y\right)\Rightarrow\left\{{}\begin{matrix}\overrightarrow{AB}=\left(-4;3\right)\\\overrightarrow{DC}=\left(1-x;2-y\right)\end{matrix}\right.\)

ABCD là hình bình hành \(\Leftrightarrow\overrightarrow{AB}=\overrightarrow{DC}\)

\(\Rightarrow\left\{{}\begin{matrix}1-x=-4\\2-y=3\end{matrix}\right.\) \(\Rightarrow\left\{{}\begin{matrix}x=5\\y=-1\end{matrix}\right.\) \(\Rightarrow D\left(5;-1\right)\)

Tâm O hình bình hành là trung điểm đường chéo AC nên áp dụng công thức trung điểm:

\(\left\{{}\begin{matrix}x_O=\dfrac{x_A+x_C}{2}=2\\y_O=\dfrac{y_A+y_C}{2}=\dfrac{1}{2}\end{matrix}\right.\) \(\Rightarrow O\left(2;\dfrac{1}{2}\right)\)

Helpppppp me!!!!!!!

1:Yes,I download games

2:No,I don't

3:I don't even know how to scan things

4:I use webcam during my zoom lesson because my teacher tell me to

5:No,I dont

          Tham khảo nha