问题描述：
the length of a rectangle is twice its width.
the length of a rectangle is twice its width.If the width of the rectangle is changing at 2in/s,how fast is the area of the rectangle changing when the area is 32 in^2?
the length of a rectangle is twice its width.If the width of the rectangle is changing at 2in/s,how fast is the area of the rectangle changing when the area is 32 in^2?
问题解答：
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