单选题
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、
(E) 22ω-pw+2k=0
【正确答案】
E
【答案解析】
[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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