07年春季班小学五年级家庭作业试题及答案第四讲(国外英文资料).docVIP

07年春季班小学五年级家庭作业试题及答案第四讲(国外英文资料) This article is contributed by yjp52099 Learn to change your destiny, and think about your future! W Contact number:Fourth lectures The volume of a solid figure Basic class Exercise four 1. (third decimal at math contest preliminaries) a cube edge length increase a times, then its volume expansion __ times. Answer: its volume expansion of a * a * a times.2. right, a cylinder and a cone, height and diameter of the bottom surface of them are marked on the map the unit is on CM. Then, the cone volume and cylinder volume ratio is how much? Answer: cone volume is 2 x 4 x = Pi Two 162 PI, the volume of the cylinder is 4 x 8 * pi = 128 PI.3 16, so the ratio of the cone volume to the cylinder volume is pi: 128 pi = 1: 24.3 13 3. (Third Session of the China Cup semi-finals) from the figure, 13 cm long, 9 cm wide rectangular cardboard to remove the four corners of the length of 2 cm square, and then along the dotted line folded into a rectangular container. This container volume is how many cubic centimeters? Answer: the bottom area of the container is: (13 - 4) * (9 - 4) =45 (CM), high 2 cm, so the volume of a container is 45 * 2=90 (CC).4. (the seventh decimal math contest finals have reported) a water filled cylindrical glass surface, 2.5 cm high, glass bottom area is 72 square centimeters. Put the cube into 6 cm long iron edge in the cup, no water. When the water flooded iron high in centimeters? Answer: to put iron after the glass as a bottom surface on the new container bottom area Is: 72 - 6 x 6=36 (CM), the volume of water is 72 * 2.5=180 (CM), then the water is high: 180 / 36=5 (CM) a 30 cm long by 20 cm wide rectangular tin.5., the side of the cylindrical container, and another piece of metal base ask, what to do to make the volume of the cylindrical container is the biggest? 10 analysis: if the length of a rectangle is high, the base of the vessel radius: 2 / pi = (20 cm). PI The volume of the 1023000 vessel is: Pi x (x) *