(2) If the lateral expansion of a cylinder is square, how many times is the height of the cylinder the radius of the bottom surface of the cylinder? (3) After cutting a 2-meter-long steel bar into two sections, the surface area increased by 6.28 square centimeters. How many cubic centimeters is the volume of this steel bar?
(4) The school bought a bundle of plastic rope, which was 135 meters long and cut 27 meters to make 15 skipping rope. According to this calculation, how many skipping ropes can be made from the remaining rope?
(5) Brother 100 yuan, brother 80 yuan. How much money does the elder brother give to the younger brother? The ratio of money between the two brothers is 7: 1 1?
(6) Mix red, white and blue flags with 10. If you close your eyes and take it, how many flags can you take at a time to ensure that the two flags must be the same color?
(7) There were 129 people attending the meeting. If you shake hands with everyone once, then you shake hands () times.
(8) Put seven kittens in three cages. No matter how you put it, there will always be at least () cats in a cage.
(9) The smallest seven digits that can form a 0 with "2", "7", "8", "5" and three "0" are (). (10) If the perimeter of a square and a circle is the same, the area of () is the largest.
Wang Fang and Li Gang each have a few dollars. If Wang Fang gave Li Gang what she originally owned, and Li Gang gave Wang Fang what he originally owned, then their money was exactly equal. The proportion of money each of them has is ().
(12) A line segment divides a rectangle into two parts, and four line segments can divide a rectangle into () parts at most. Two shepherds are herding sheep. A said to B, "Give me your sheep 1. My sheep are exactly twice as big as yours. " B said to A, "You'd better give me 1 sheep, so that the number of your sheep and mine will be equal." Excuse me, A has () sheep and B has () sheep.
(14) The price of 7 kg apples and 4kg pears is similar, and the price of 1kg pears is higher than that of 1kg apples in 0.6 yuan. How much are pears and apples per kilogram?
(15) There are two bags of sugar, one with 84 pieces and the other with 20 pieces. Take 8 pieces from the extra bags and put them in fewer bags at a time. How many times do you have to eat to make these two bags of sugar equal?
The answer to this interesting math problem is:
(1) Answer 4 correctly and answer 1 incorrectly.
(2) 2 times.
(3)628 cubic centimeters
(4)60 pieces
(5)30 yuan
(6) Four sides
(7) 128 times
(8)3
(9)2005780
(10) circle
( 1 1)4:3
(12) 1 1
(13) A has (7) sheep, and B has (5) sheep.
(14) pear 1.4 yuan per kilogram, apple 0.8 yuan per kilogram.
(15) 4 times.