问题
单项选择题
A rectangular circuit board is designed to have width叫inches, perimeter p inches, and area k square inches. Which of the following equations must be true ？（）
A．ω2+pω+k=0
B．ω2-pw4+2k=0
C．2ω+pw+2k=0
D．2ω-pω-2k=0
E．22ω-pw+2k=0
答案
参考答案：E
解析：
根据宽、周长和面积之间的相互关系可以列出下面的等式：
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