Cho hình hộp đứng ABCD.A'B'C'D' có đáy ABCD là hình chữ nhật, AB=2a, AD=a, AA'=3a. Mặt phẳng qua A vuông góc với A'C cắt cạnh BB', CC', DD' lần lượt tại I,J,K. Tính diện tích thiết diện AIJK.

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