The scale of the figure below is 1:200. According to the conditions, we can calculate the actual area of the figure, which is 10cm in length and 6cm in width

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• 1. A rectangular land, length increased by 4 meters, area increased by 80 square meters; width increased by 4 meters, area increased by 200 square meters?
• 2. The circle is 15 cm high and 10 cm in diameter. How many square meters is the area
• 3. The roller of a roller is 10 meters long and 0.8 meters in diameter. If it rolls 20 times, how many meters will it advance? What is the area of the road surface?
• 4. (1) Someone uses one side (the wall is 7.5 meters long) and a 13 meter long bamboo fence as the other three sides to form a rectangular vegetable garden with an area of 20 square meters How many meters are the length and width of the square garden? (2) if the area in (1) is 23 square meters, can it be enclosed into a rectangular garden that meets the conditions? Why?
• 5. The perimeter of a rectangular land is 120 meters, of which the width ratio is 13 meters. The area of this land is () square meters
• 6. If the length of a rectangular farm is increased by 5 km, the area will increase by 15 square kilometers. If the width is increased by 6 km, the area will increase by 48 square kilometers?
• 7. A simple method to calculate the square of (half a-b) - quarter (a + b) (a-b)
• 8. Calculate the power of 5 (the third power of a) 4-13 (the sixth power of a) 2
• 9. Given that the point (1,1 / 3) is a point on the image of the function f (x) = a ^ x (a > 0 and a ≠ 1), the sum of the first n terms of the proportional sequence {an} is f (n) - C, and the sequence {BN} (BN) And ∵ SN-S (n-1) = √ Sn + √ s (n-1) ∴√Sn-√Sn-1=1 How is this converted
• 10. Given the function f (x) = x-sinx, the sequence {an} satisfies a (n + 1) = f (an) and 0 〈 A1 〈 1, prove 0 〈 an 〈 1 by mathematical induction
• 11. The length and width of a rectangle is the whole meter, and its area is 375 square meters. It is known that its width is 10 meters less than its length. How many meters is the sum of its length and width?
• 12. The rectangle is 80 meters long and 60 meters wide. Now the length and width are increased by 20 meters. How many square meters is the current area
• 13. The Red Sun Plaza originally had a rectangular flower bed, 40 meters long. Later, when it was expanded, the length was increased by 20 meters, resulting in an increase of 400 square meters in area. How many square meters does the flower bed now cover?
• 14. A fish pond is 28 meters long, 15 meters wide and 1.8 meters deep. How many square meters does it cover? How many cubic meters of livestock water can be used at most?
• 15. The basketball court is 28 meters long and 15 meters wide. How many square meters is its area? How many square meters is the half court?
• 16. How many square meters is 5 meters long and 4 meters wide
• 17. How to calculate the square of a square exhaust pipe? For example, the width is 40 meters, the height is 80 meters, and the length is 25 meters, Don't Scribble if I don't know the formula I want
• 18. A swimming pool is 300 decimeters long and 25 meters wide. How many square meters is the area of this swimming pool
• 19. Length is 13 meters, width is 15 meters, how to calculate how many flat, what is the calculation formula?
• 20. It's 12 meters long and 4 meters wide. How many square meters is it,