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Xiao Ming's daily life is very regular. The following is his usual time to go to bed and get up. About a few parts of his day is in sleep Go to bed at 9:00 on the first night Get up at 6:00 the next morning Expressed in fractions
Sleep time is 18:00-9; 00 = 9 (hours)
9/24=3
——
eight
A: he sleeps about three eighths of the time every day
Xiao Ming deposits 1000 yuan in the bank and takes out 500 yuan to donate to the disaster area one year later. Then he deposits the remaining 500 yuan and the due interest one year at a fixed time. If the annual interest rate of the deposit remains unchanged, he can take out 660 yuan in the later period and ask for the annual interest rate
Let the annual interest rate be X. according to the meaning of the question, we can get: 1000 (1 + x) - 500] (1 + x) = 660. The solution is: X1 = 0.1, X2 = - 1.5. Answer: the annual interest rate is 10%
It costs 200 yuan to buy two basketball and one football, and 160 yuan to buy one basketball and two football. How much is the unit price of basketball
Basketball 80 yuan, football 40 yuan
The ticket price (RMB) of the football quarter finals announced by the Organizing Committee of Doha Asian Games in 2006 is 300 yuan for the first-class seats, 200 yuan for the second-class seats and 125 yuan for the third-class seats. In the promotion activities, a sportswear company organized a total of 36 customers who won the grand prize and the first prize to watch the football quarter finals in Doha, Qatar. After excluding other expenses, it plans to buy two kinds of tickets After 5025 yuan, you can design several ticket schemes for the company to choose and explain the reasons
Let X be the first class seat and y be the second class seat. Then 300X + 200y = 5025x + y = 36, where x and y are not positive integers and should be rounded off. Let X be the first class seat and y be the third class seat. Then 300X + 125Y = 5025x + y = 36, x = 3 and y = 33. Let X be the second class seat and y be the third class seat
There are five football teams a, B, C, D and E in the same group to compete for the qualification. The rules of the game are as follows: 3 points for winning one game, 1 point for drawing one game, 0 point for losing one game. The top two teams in the group will get the qualification. After the group match, if the score of team a is 9, how many wins, how many draws and how many losses does team a have? (2) If there is a team in the group stage who wins all, can team a qualify? (3) If there is a team with 10 points in the group match, can team a qualify?
(1) ∵ five teams play a single round-trip football match, only once every two teams, and each team plays four times with other teams. Suppose team a wins x, draws y, and X + y ≤ 4. ∵ 3x + y = 9, x = 3, y = 0, so team a's record is 3-0-1
The three teams of a, B and C play a football match every two games. It is known that the total number of goals of team a is 0, and there is a draw in one game. Team B wins one game 1-0 and loses one game 0-2
A 0-0, B 2-0. A win and a draw, 4 points, two goal difference ranking first
It is known from the fact that B has no draw that a's draw is between a and C. because a has no goal, it is 0-0. Then a loses one game and B wins one, so it is B who wins a 1-0. So the rest is C who wins B 2-0
The three teams of a, B and C have a football match. Every two teams have a match. It is known that the total number of goals of team a is 0, and one game is a draw. Team B wins one game one to zero and loses one to two. Judge the result of team C
C: a 0:0, C: B 3:0
A math problem: 50 to 50（
(5 / 4) x = 50, x = 40, so the number of () is 50
x-1/5=8 (x+0.9)=5(x-1.
x-1/5=8 (x+0.9)=5(x-1.
x-1/5=8
x=8+1/5
x=8.2
(x+0.9)=5(x-1.7)
x+0.9=5x-8.5
x-5x=-8.5-0.9
-4x=-9.4
x=23.5
(-85)x(-25)x(-4) （9/10—1/15）x30
(-85)x(-25)x(-4)
=-25x4x85
=100x85
=-8500
（9/10—1/15）x30
=9/10x30-1/15x30
=27-2
=25
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