1. Multiple choice questions: (3 points for each question) 1. It is known that the real number A satisfies: then A-20042 = () A2003B 2004C 2005D20062. A store can make a profit of m yuan when selling a certain commodity, with a profit rate of 20% (profit rate =). If the purchase price of the commodity is increased by 25% and the store increases the price of the commodity to M yuan per piece, the profit rate after the price increase is () A 25% B 20% C16% D12.5% 3. Cut a square piece of paper, as shown. Cut it into triangles and trapezoid. If the area ratio of triangle to trapezoid is 3: 5, then the perimeter ratio is () A 3: 5B 4: 5C5: 6D6: 74. Let α and β be two real roots of equation 2x2-3│x│-2=0. The value of is (). D5 a- 1b 1c。 The coordinate origin O and point A(2, -2) are known, and B is a point on the coordinate axis. If △AOB is an isosceles triangle, there are () such points b.a4b5c6d86. In the unary quadratic equation x2+mx+n=0, the coefficients m and n can be 1, 2, 3, 4, 5, 6, and different equations are obtained. The equations with real roots are () a 20 b19 c16 d107. The purchase price of a commodity is 1600 yuan, and it is sold at a 10% discount according to the marked price of 2000 yuan; Commodity B is purchased in 320 yuan and sold at 20% off the bid price in 460 yuan. The profit rate of these two commodities is (). A is higher than B, B is higher than A, and C is the same. Above D is incorrect. 8. The price of a commodity was increased by 25% in May 2000, and the original price was restored in May 200 1 year. Then the price will be reduced (). A 15% B 20% C 25% D 30%9。 Reach out a hand and count the words from the thumb, as shown in the right figure: 1, 2, 3, 4, ..., then 2006 falls on (). A thumb, b index finger, c middle finger, d ring finger, 10. In ancient life, a lot of mathematical knowledge was used. For example, there was a problem: the customer bank could be distinguished by the partition wall, but the number was unknown. Seven is more than four, and nine is less than half a catty. (Note: the ancient scale weighed one catty 16) Please think about how many people there are. () Six people in A, five people in silver forty-four liang b, six people in silver thirty-nine liang c, five people in silver forty-six liang d and thirty-seven liang in silver 1 1. A class of students went to take part in voluntary labor, one of them went to an orchard to pick pears, the first student who entered the garden picked/kloc-0 pears, the second student picked two pears, and the third student picked three pears. Later students picked 1 pear more than the previous students, which just means that each student picked 6 pears. Could you tell me the number of students in this group is ()? A 6 people B 10 people C 1 1 person D 12 people 12. Ride a motorcycle from home to the railway station. Walk 30 kilometers per hour and arrive 15 minutes earlier than the driving time. If you walk18km every hour, you will arrive at the railway station15min later than the driving time. Now you plan to arrive at the railway station 10 minutes earlier than the driving time. Then the speed of motorcycle should be () A 25 km/h, B 26 km/h, C 27 km/h, D 28 km/h, 13. The per capita housing area is related to the total housing area and population. A city has a total population of 500,000 and a per capita housing area of 30㎡. At present, the population is increasing by 2% every year and the per capita housing area is increasing by 5%. Then the total housing area is increasing every year (). a 2% B 5% C 10% D 7. 1% 14。 During the winter solstice, the sun deviates farthest from the northern hemisphere. As long as you can collect sunlight at this time, you can get direct sunlight all year round. A real estate company plans to build several "sunshine-type" residential buildings (as shown in Figure 4), which are m high and arranged in the north-south direction. At this time, a one-meter-long bamboo pole was erected, and its shadow length was b meters. If the lighting of the back building is not affected all the year round, the two floors should be separated (). Methyl, ethyl, propyl, butyl, rice 15. Spring Festival.

I think the answer to the third grade math sunshine plan is very complicated. I had a hard time answering it. Give me the best answer. Thank you! gangue crusher