(1) On a map, the actual distance of 30 kilometers is represented by 3 cm line segments. The scale of this map is () (2) The length of a part is 5mm. If you draw it on a 10:1 scale drawing, you should draw () cm (3) On a map with a scale of 1:300000, the distance between a and B is 12 cm, and the actual distance between them is () km; if the scale of 1:500000 is used, the distance between a and B should be () cm (4) A rectangular piece of land is 75 meters long and 30 meters wide. Draw it on a drawing at a scale of 1 / 1000. How many centimeters should it be long and how many centimeters should it be wide? (5) On a map, the actual distance is 600 km with a 3 cm line segment. On this map, the distance between a and B is 4.5 cm. What is the actual distance between a and B? (6) According to the drawing with the scale of 1 / 2000, the length of a rectangular test field is 4cm and the width is 3cm. What is the actual area of the test field? (7) A triangular flower bed, measured on the plan, is 4cm low and 3cm high. It is known that the scale of this plan is 1:1000, and the actual area of this flower bed is () square meters? (close at 10 o'clock) (8) the radius ratio of circle a and circle B is 2: the total area of these two circles is 260 square centimeters. How many square centimeters is the area of each circle? The formula. Also want to

(1) On a map, the actual distance of 30 kilometers is represented by 3 cm line segments. The scale of this map is () (2) The length of a part is 5mm. If you draw it on a 10:1 scale drawing, you should draw () cm (3) On a map with a scale of 1:300000, the distance between a and B is 12 cm, and the actual distance between them is () km; if the scale of 1:500000 is used, the distance between a and B should be () cm (4) A rectangular piece of land is 75 meters long and 30 meters wide. Draw it on a drawing at a scale of 1 / 1000. How many centimeters should it be long and how many centimeters should it be wide? (5) On a map, the actual distance is 600 km with a 3 cm line segment. On this map, the distance between a and B is 4.5 cm. What is the actual distance between a and B? (6) According to the drawing with the scale of 1 / 2000, the length of a rectangular test field is 4cm and the width is 3cm. What is the actual area of the test field? (7) A triangular flower bed, measured on the plan, is 4cm low and 3cm high. It is known that the scale of this plan is 1:1000, and the actual area of this flower bed is () square meters? (close at 10 o'clock) (8) the radius ratio of circle a and circle B is 2: the total area of these two circles is 260 square centimeters. How many square centimeters is the area of each circle? The formula. Also want to

(1) On a map, the actual distance of 30km is represented by 3cm line segments. The scale of this map is (1:1000000)
(2) If a part is 5mm long, it should be drawn (5cm) on a 10:1 scale drawing
(3) On the map with the scale of 1:300000, the distance between a and B is 12 cm, and the actual distance between them is (36) km; if the scale of 1:500000 is used, the distance between a and B should be (7.2) cm
(4) A rectangular piece of ground is 75 meters long and 30 meters wide. Draw it on the drawing with a scale of one thousandth. How many centimeters should be drawn for its length? (7.5cm) and how many centimeters for its width? (3cm)
7500/1000=7.5cm
3000/1000=3cm
(5) On a map, a 3cm line segment is used to represent the actual distance of 600km. On this map, the distance between a and B is 4.5cm. What is the actual distance between a and B? (900km)
600/3=200km
4.5*200=900km
(6) According to the drawing with the scale of 1 / 2000, the length of a rectangular test field is 4cm and the width is 3cm. What is the actual area of the test field? (4800 square meters)
4*2000=8000cm
=80m
3*2000=6000cm
=60m
60 * 80 = 4800 square meters
(7) a triangular flower bed, measured on the plan, is 4cm low and 3cm high. It is known that the scale of the plan is 1:1000, and the actual area of the flower bed is (600) square meters?
4*1000=4000cm
=40m
3*1000=3000cm
=30m
40 * 30 / 2 = 600 square meters
(8) The radius ratio of a and B circles is 2:3. The total area of these two circles is 260 square centimeters. How many square centimeters is the area of each circle?
Because the radius ratio of the two circles is 2:3
So the area ratio of two circles is the square of π 2: the square of π 3
4：9
So a circle is 4 / (4 + 9) * 260 = 80 square centimeters
The other circle is 9 / (4 + 9) * 260 = 180 square centimeters