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标题: 天山 7-11 [打印本页]

作者: odie 时间: 2004-12-26 19:56
标题: 天山 7-11

Q11: 圖貼布上來ㄚ

Note: Not drawn to scale.
A rectangular picture is surrounded by a boarder, as shown in the figure above. Without
the boarder the length of the picture is twice its width. If the area of the boarder is 196
square inches, what is the length, in inches, of the picture, excluding the boarder?
A. 10
B. 15
C. 30
D. 40
E. 60

Please give me a help!! thanks!!

作者: charmant 时间: 2004-12-26 20:27
没图怎么办啊

作者: charmant 时间: 2004-12-26 20:29
关键是不知道boarder有多厚

作者: odie 时间: 2004-12-27 12:06

the width of boarder=2

sorry!! I can't paste the picture!

作者: charmant 时间: 2004-12-27 13:11

[attachimg]24192[/attachimg]

为了节约空间，颜色只能差一些了，不知能否说清楚

我Guess图应该是这样的吧

作者: luzhihong1978 时间: 2005-4-19 13:40

设原rectangular长为xy,宽为x

y=2x

(y+4)(x+4)-xy=196

求解,x=15,y=30

作者: luzhihong1978 时间: 2005-4-19 13:44

sorry,有点小错误,长为y

作者: channing76 时间: 2005-5-3 19:56

以下是引用luzhihong1978在2005-4-19 13:40:00的发言：

设原rectangular长为xy,宽为x

y=2x

(y+4)(x+4)-xy=196

求解,x=15,y=30

作者: mayce 时间: 2006-7-18 16:39
boarder 是不是蓝色区域部分呢？

作者: mayce 时间: 2006-7-22 18:46
up!

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