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Can you tell me how to write these three math problems? 1. There is a rectangular chicken farm with an area of 150 square meters. One side of the chicken farm is against the wall, and a door with a width of 2 meters is set on the opposite side of the wall. The other three sides (except the door) are surrounded by bamboo fences, with a total length of 33 meters 2. A factory plans to reduce the cost to 64% in two years. If the annual reduction percentage is the same, calculate the percentage 3. If you sell a commodity with a purchase price of 100 yuan at 120 yuan, you can sell 500 pieces. It is known that every 1 yuan increase in the price of this commodity will reduce the sales volume by 10 pieces. If you want to get a profit of 12000 yuan, what should be the selling price? How many pieces should be purchased at this time? It is enough to set an unknown number
1. Only one is OK. Because the other three sides are surrounded by bamboo fence, the total length is 33 meters, and the width of the door is 35 meters. Then, let the length of the wall be x, so the length of the other two sides is (33-x) / 2, so x × (33-x) / 2 = 150, and you can know. 2
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