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[Problem Solving]

试题详情

题目:

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?

选项:

A、10
B、15
C、30
D、40
E、60

答案:

C

提问:

设picture的宽为x,长就为2x, 196=(2x+4)*(x+4)根据方程怎么接触的宽后*2也不是30这个答案阿 请老师讲解 谢谢

解答:

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阅读1173
解答: sysadmin

提问:

设picture的宽为x,长就为2x, 196=(2x+4)*(x+4)根据方程怎么接触的宽后*2也不是30这个答案阿 请老师讲解 谢谢

解答:

点赞-1
阅读1174
解答: sysadmin老师

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