$$A_1B_1C_1D_1$$,$$A_2B_2C_2D_2$$,$$A_3B_3C_3D_3$$are square.$$A_1B_1C_1D_1$$,$$A_2B_2C_2D_2$$are midpoints. What is the ratio of the area of the shaded part to the area of the unshaded part?
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数学PS
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$$A_1B_1C_1D_1$$,$$A_2B_2C_2D_2$$,$$A_3B_3C_3D_3$$are square.$$A_1B_1C_1D_1$$,$$A_2B_2C_2D_2$$are midpoints. What is the ratio of the area of the shaded part to the area of the unshaded part?
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正确答案: B