一道SAT数学题!
Atabeach,arectangularswimmingareawithdimensionsxandymetersandatotalareaof4000squareme...
At a beach, a rectangular swimming area with dimensions x and y meters and a total area of 4000 square meters is marked off on three sides with rope, as shown above*, and bounded on the fourth side by the beach. Additionally, rope is used to divide the area into three smaller rectangular sections. In terms of y, what is the total length, in meters, of the rope that is needed both to bound the thre
to bound the three sides of the area and to divide it into sections?
A) y + 4000/y
B) y + 16000/y
C) y + 16000/3y
D) 3y + 8000/3y
E) 3y + 16000/3y
最主要我不懂题目什么意思!答案选B 展开
to bound the three sides of the area and to divide it into sections?
A) y + 4000/y
B) y + 16000/y
C) y + 16000/3y
D) 3y + 8000/3y
E) 3y + 16000/3y
最主要我不懂题目什么意思!答案选B 展开
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意思是(未必是全部直译):在海边用绳子围成一个两边为x米, y米的矩形区(第4边是岸; 面积4000平方米),然后用绳子将该矩形分为三个小矩形(参见图,显然这些绳子与长为x米的边平行),将全部绳子的长度用y表示。
L = y + 4x = y + 4*4000/y = y + 16000/y 米
L = y + 4x = y + 4*4000/y = y + 16000/y 米
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