题目信息
A circular table has a glass center with a diameter of 4x inches, which is surrounded by a metal ring with a width of 2 inches. In terms of x, what fraction of the table's surface is made up by the metal ring?
A:$${1}\over{x+1}$$
B:$${1}\over{x}$$
C:$${x}^{2}\over({x+1})^{2}$$
D:$${2x}+1\over({x+1})^{2}$$
E:$${x}\over{x+1}$$
参考答案及共享解析

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已选答案:
正确答案:
D:$${2x}+1\over({x+1})^{2}$$
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