For a window with an area of 4 square meters, what is the value of a:b (ratio of the length and width of the outer frame) and the material used for the frame of the window is the most economical?
一个面积是4平方米的窗户，当a：b(外框长和宽的比)的值是多少时，窗户的框架所用的材料最省？
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