题库搜索>问题求解PS-12206
A circular mat with diameter 20 inches is placed on a square tabletop, each of whose sides is 24 inches long. Which of the following is closest to the fraction of the tabletop covered by the mat?
分析A选项
分析B选项
分析C选项
分析D选项
分析E选项
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圆的面积是Pi*10*10,正方形的面积是24*24, 结果为（Pi*10*10）/(24*24)=0.545, 最接近1/2
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不用计算的方法： (π * 10²)/(24*24)≈314/25²≈314/625约等于1/2 但是因为刚才分母用了更大的数字25，而且分子舍去了千分位以后的数字，所以整体数字肯定要比 1/2 大一丢丢。 看选项前两个排除，1/2 后面直接 3/4 了，比 1/2 大太多。选 1/2
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2021-11-04 15:04:00
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