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Life expectancy among adults 45 and 65 years of age by family income, sex, and r
Life expectancy among adults 45 and 65 years of age by family income, sex, and r
游客
2025-02-24
29
管理
问题
Life expectancy among adults 45 and 65 years of age by family income, sex, and race: United States, average annual 1979-89
[br]
In the figure above, the diameter of the circle is 20 and the area of the shaded region is 80π. What is the value of a + b + c + d?
选项
A、144
B、216
C、240
D、270
E、288
答案
E
解析
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