A-A+
A rectangular tabletop consists of a piece of
问题详情
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？
A．12
B．10
C．9
D．8
E．6请帮忙给出正确答案和分析，谢谢！
参考答案
正确答案：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
