2. After sawing a cylindrical wood with a length of 1 m into two sections according to the ratio of 2:3, the surface area increased by 5 square decimeters, and the volume of the longer section of wood was (1.5) cubic decimeter.
3.5 The referee graded the gymnasts. If one of the highest and lowest scores is removed, the score is 9.62. If only one lowest score is removed, the average score is 9.69 and the highest score is (9.9).
4. A series of numbers are arranged according to 1, 2, 2, 3, 3, 4, 4, ... From the first number on the left, the 56th number is (1 1).
2. Multiple choice problem
1. Saw a piece of wood with uniform thickness into four sections, and the sawing time of one section is the time required to complete sawing (B).
1/4
2. A rectangle has a certain circumference, length and width (C).
A. directly proportional; Inverse ratio; be disproportionate
3. A person needs 15 points to climb the mountain, and14 points to descend the mountain, (b) points to descend the mountain.
13 b . 12 c . 1 1
4. It can't be (A) to use two isosceles right-angled triangles as quadrangles.
A. isosceles trapezoid B. right-angled trapezoid C. parallelogram
5. For a commodity, the price is increased by 20% first, and then the price is reduced by 20%. Compared with the original price, (b)
A. raise B. lower C. unchanged
Three. calculate
( 1)[0.85-(9/ 16-0. 15)]×8/2 1
=[0.85-33/80]*8/2 1=(35/80)*(8/2 1)= 1/6
4. Application questions
1. The distance between multiple lines is 5*4, and the ratio of multiple lines is 52%-48%.
(5*4)/(52%-48%)=500 (km)
2. If you buy according to the children's ticket, 46* 10=460 (yuan)
If it is a group ticket purchase and 50 tickets enjoy a 20% discount, then 10*50*0.8=400 (RMB).
And there are four extra tickets to resell, so it is obviously more cost-effective to buy 50 tickets.