If the circumference of a rectangle is 12cm and its length is x, then the analytic expression of the function of Y with respect to X is? What is the value range of the independent variable x?

2x+2y=12;x+y=6;y=6-x(0

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1. A rectangle with a length of 12cm and a width of 8cm is reduced by 1:4. The perimeter of the figure is () cm and the area is () square cm
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