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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
我算的过程是(2x+4)*(x+4)-(2x*x)=196
怎么算怎么是 里面的长方形长为30 因为有一个include 所以最后答案我觉得是30+4 啊 计算过程哪里错了,请大家帮帮忙 |
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