在平面直角坐标系中, 点集A="{(x," y)| }, 点集B="{(x," y)| , 则点集M="{(x," y)|x=x+x, y=y+y, (x, y)A, (x, y)B}所表示的区域的面积为_____________.
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在平面直角坐标系中, 点集A="{(x," y)| }, 点集B="{(x," y)| , 则点集M="{(x," y)|x=x+x, y=y+y, (x, y)A, (x, y)B}所表示的区域的面积为_____________.