Mark rides bicycle from his house to school with a speed of 15 km/h and arrives at the school 20 minutes late. However, if he rides with 20 km/h, he would reach the school only 5 minute late. Find the distance between his house and the school.
Answer: The distance between his house and the school is ........... km.
The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.
When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... km.
The Ford car left Hanoi for Nghe An and the Audi car left Nghe An for Ha Noi at the same time. The ratio of their speeds (the Ford car to the Audi car) was 4 : 3. The Ford decreased its speed by 25% and the Audi car increased its speed by 25% after they had passed each other.
When the Ford car reached Nghe An, the Audi car was still 20km away from Hanoi. The distance between Hanoi and Nghe An is ...... km
Trả lời kỹ càng giúp mjk nha :)))
Nghiêm cấm mấy thành phần trả lời I don't know vv.... Biết hẵng trả lời nha :)))
School roof of whether they have faded but still uncertain, including two suites and three rooms for administrative areas. In my class very clean and tidy because we are very conscious of hygiene and clean.
The school's students are learning there are many shade trees and benches in the school yard, I love my school and I come to school every day.
The teacher told us to always obey the rules of the school, and we do not write graffiti on the desk to keep you clean and beautiful school.
I really like going to school because each met many friends, to meet teachers. This school is the place lit dream for me, I would later dream of becoming a teacher to teach at this school.
1,A circular cynlinder with a volume 81 pi.if the perimeter of the base is 6 pi,the height is ?
2,The total surface area of 2 indentical blocks which together with the volume is 1,458 units is ?
3,If one side of 6-inch ruler will be marked in inches,how many points will be in the edge including 0 and 6 inch mark?
4,Two sides of the O and P pointer that started from a vertical position as shown.Pointer O turns back the clock with a speed of 5 degrees per second and pointer P rotate clockwise at9 degrees per second.How many complete revolutions will be made when completing 335 P O complete revolution?
5,In a certain game of 50 questions,the final score calculated by subtracting tiwce the number of wrong answer from the total number of correct answers.if a player has tried all questions and get a final score of 35 ,the number of wrong answers,he has to be ...
Lesson 1: analyzing the polynomial factors.
Notes + 2 x-1
x 3 + 6x2 + 11x + 6
x 4 + 2 x 2-3
AB + ac + b2 + 2bc + c2
A3-b3 + c3 + 3abc
Lesson 2: for functions:
search conditions of x to A means.
A shortening.
Computer x to A < 1.
Post 3: prove the inequality:
For a + b + c = 0. Prove that: a3 + b3 + c3 = 3abc.
For a, b, c are the sidelengths of the triangle. Proof that:
Prove that x 5 + y5 ≥ x4y + xy4 with x, y ≠ 0 and x + y ≥ 0
Lesson 4: solve the equation:
x 2-3 x + 2 + | x-1 | = 0
Lesson 5: find the largest and smallest value (if any)
A = x 2-2 x + 5
B =-2 x 2-4 x + 1.
C =
Lesson 6: calculate the value of expression.
Know a – b = 7 feature: A = (a + 1) a2-b2 (b-1) + ab-3ab (a-b + 1)
For three numbers a, b, c is not zero catches up deals for equality:
Computer: P =
Article 7: proof that
8351634 + 8241142 divisible 26.
A = n3 + 6n2-19n-24 divisible by 6.
B = (10n-9n-1) divisible 27 with n in N *.
Article 8:
In the motorcycle race three cars depart at once. The second car in a one-hour run slower than the first car 15 km and 3 km third cars. rapidly should the destination more slowly the first car 12 minutes and the third car earlier today. No stops along the way. Calculate the speed of each car, race distance and the time each car
điền từ
On March 3, 1847, Alexander Graham Bell(1)......... in Edinburgh. He was a(2)...... When he was a young(3)......., he(4)...........with parents to Canada and then to the USA. In America, he worked(5).......... deaf-mutes at Boston university. Soon, Bell started experimenting(6)......... ways of transmitting speech over aming distance. This led to the invention of the telephone.
1. born ; was born ; was boring ; bore
2. Scotland ; Scotsland ; Scotman ; Scotsman
3. man ; men ; worker ; teacher
4. move ; moving ; moved ; moves
5. with ; on ; as ; for
6. of about ; with ; at ;
DIEN :in, at , on , after , under , between , beside, among , out of , above . vi sao ?
I LOST MY KEYS SOMEWHERE ................. THE CAR AND THE HOUSE
I OFTEN FEEL NERVOUS WHEN I AM ............. STRANGERS
If you walk 45 minutes at a rate 4km/h and then run for 30 minutes at a rate of 10km/h, how many kilometers will you have gone at the end of one hour and 15 minutes?
The charges for the usage of per m3 of water and per kWh of electricity are $1.94 and 26 cents respectively. In May, Mr Kumar used x m3 of water and y kWh of electricity and his bill came to $272.10. In June, his bill came to $202.60 for the usage of (x-5) m3 of water and (3y - 1950) kWh of electricity. Form two equations in x and y and solve these two equations to find the total cost of using (x+8) m3 of water and (2y-725) kWh of electricity.
