2. The difference between the denominator and the numerator of a real score is 18, and the score is reduced to 5/8, and the original score is (30/48).
3,2008 ÷ A = 31... b, given that both A and B are integers, then A+B = (88).
4. It took a car four hours to go back and forth between A and B, and the speed increased by 1/5 when it came back, and it took (10/3) hours when it came back.
5. Fill in the numbers according to the rules.
( 1) 1 ( 1/2)、3(3/5) 、5 (8/ 13)、7(2 1/34 )、9(55/64 )、 1 1( 1 19/ 130 )
(2)2 ( 1/4)、4 (4/9)、8(9/ 16) 、 16 ( 16/25)、32(25/36 )、64(36/49 )
6. A four-digit number. Add a decimal point to the original number. The total is 2028.08, and the original four digits are (2008).
7. A stock that fell by 20% that year should rise by (25 )% this year to maintain its original value.
8. No graph and no solution
Two, the calculation problem (3 points)
1、 1/2 1+202/2 12 1+50505/2 12 12 1 + 13 13 13 13/2 12 12 12 1
= 1/2 1+2/2 1+5/2 1+ 13/2 1
= 1
2、2008× 13/20+200.8×4.3+20.08×8
=20.08×65+20.08×43+20.08×8
=20.08×(65+43+8)
=2329.08
Iii. Application problems (12 points)
1. A basketball is more expensive than a volleyball, 30 yuan. The price of six basketballs is equal to the price of eight volleyballs. If you spend 1440 yuan to buy all the basketballs, how many can you buy? 6×30/(8-6)=90 yuan 1440/90= 16 (piece)
2. A cylindrical glass holds water with a water level of 2.5cm and an inner bottom area of 72cm2. After putting a cubic iron block with a length of 6 cm in this cup, the water surface did not drown the iron block. How high is the water surface at this time? 6×6×6=2 16 (cubic centimeter) 2 16/72=3 (centimeter) 3+2.5=5.5 (centimeter)
3. The diesel oil carried by small marine research vessels can only be used for 18 hours at most. The research ship set sail from the dock and sailed out smoothly at a speed of 40 kilometers per hour; When going back to the present time, the distance per hour is 4/5 of that when going back. For the sake of safety, how far can the research ship sail back at most? Solution: If the scientific research ship sails for x meters at most, it should return.
18-x/40=x/(40 ×4/5)
18=x/32+x/40
18 = x×( 1/32+ 1/40)
x= 18/9/ 160
x=320
4. The retail price of children's amusement park tickets is one 5 yuan. There are 46 people in class 6 (1). Please design two ways to buy tickets according to the regulations of the Children's Paradise Management Office (as shown in the figure), and point out which way is the cheapest and at least how much.
Mode 1: no graph and no solution.
Buy more than 50 group tickets (including 50 tickets), and the price of each ticket is 80% of the original price.
50×5×80%=200 (yuan)
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