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SAT数学题求翻译及完整解题步骤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
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SAT数学题求翻译及完整解题步骤
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 table is 3 feet wide, what is its approximate length,in feet?
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 table is 3 feet wide, what is its approximate length,in feet?
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答案和解析
长方形面积为x平方英尺,周长x英尺,宽3英尺,求长几尺?
设长为a,x=2*（a+3）=3a,解得a=6,长6英尺
设长为a,x=2*（a+3）=3a,解得a=6,长6英尺
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