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我們新編初級中学課本代数上册“習題四”中有下面兩个題目: 第9題:如果桶腰(圖1)的直徑是D厘米,兩个底的直徑都是d厘米,高是h厘米,那末桶的体积的近似值是: V=π/4(2D+d/3)~2h(立方厘米),这里π≈3.14。如果桶腰的直徑是90厘米,兩个底的直徑都是60厘米,高是110厘米,求它的体积的近似值。第10題:要近似地計算干草堆(圖2)的体积,可以用下面的公式:
Our newly-booked junior middle school textbook algebra on the first volume of “Exercise 4” has the following two topics: Question 9: If the diameter of the barrel waist (Figure 1) is D cm, the diameter of both bottoms is d cm and the height is h cm. The approximate value of the bucket’s volume is: V=π/4(2D+d/3)~2h(cubic centimeter), where π≈3.14. If the barrel waist is 90 centimeters in diameter, both bottoms are 60 centimeters in diameter and 110 centimeters high. Find the approximate value of its volume. Question 10: To approximate the volume of the haystack (Figure 2), use the following formula: