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A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface ar
A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface ar
admin
2009-05-19
26
问题
A rectangular tabletop consists of a piece of laminated wood bordered by a thin metal strip along its four edges. The surface area of the tabletop is x square feet, and the total length of the strip before it was attached was x feet. If the tabletop is 3 feet wide, what is its approximate length, in feet?
选项
A、12
B、10
C、9
D、8
E、6
答案
E
解析
一个长方形的桌面由一块四周镶有薄金属条的薄木板组成,桌面的面积为x平方英尺,金属条在镶上去之前的总长度为x英尺,若桌面的宽度为3英尺,问其长度大约是多少英尺?
解:本题的正确答案为(E)。设桌面的长度为y英尺,则2(y+3)=x, 3y=x , so, y=6
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