Tại sao người ta thường sơn nhà màu trắng?

CM đa thức sau luôn dương
A=x²/4-3x+12

Viết đa thức dưới dạng HĐT
$\frac{x^2}{4}-3x+9$

e) 3 ^ n + 1 - 2.3 ^ n

(x²-2x+3) (x-5)

d) (x ^ 2 * y ^ 2 - xy + y)(x - y)

Đặt câu hỏi với từ viết hoa:
he doesn't go to school BECAUSE HE IS ILL

Cho tứ giác ABCD. Chứng minh rằng:
AB+BC+CD+DA/2 <AC+BD<AB+BC+CD+DA

To make sure you get in, we would recommend you book a.... in advance.
A.table B.desk C.seat D.position

Cho tam giác ABC cân tại A. Trên các cạnh AB,AC lần lượt 2 điểm P,Q sao cho AP=AQ. Hai đoạn CP,BQ cắt nhau tại O. Giao điểm của AO và BC là H
TÍNH GÓC AHC= ?°

Tìm lỗi sai và sửa
1,She is already sitting near the car, waiting for her husband to come in and drive her to the office.
2, I'm not sure this is the right way on the train station
3, My father prefer to go with the train as he can enjoy the landscape though windows
4. I'm by the way to the supermarket. Do you need to buy anything?

Tìm đa thức P: (-4xy - 9y)-P = -8xy+8x-6y

Tìm đa thức P: P- (3y³+6x-5y) = y³+8y

Twenty years ago, most people around the world.....(not know) what the internet was

The International Robot...... is the largest robot trade fair in the world (exhibit)

He gets a lof of...... from football (enjoy)

..... is a marathon in miles? About 26 miles. A. How often B. How many C. How long D. How wide

soil/ I/ do/ on/ pollution/ will/ a/ survey A. I will do a survey on soil pollution B. I will do soil pollution on a survey C. I will survey a do on soil pollution D. I will do a soil pollution survey on

area/ has become/ my/ great/in/ pollution/ Water/problem/ a. A. Water in my area pollution has become a great problem B. Water problem has become a great pollution in my area C. Water pollution in my area has become a great problem D. Water pollution has become a great problem in my area

Cho biết thành tựu văn hóa của người dân Chăm-Pa