Cho hình bình hành ABCD có I, J lần lượt là trung điểm của AB và CD. a) Chứng minh AICJ là hình bình hành. b) Gọi E, F lần lượt là giao điểm của AJ, CI với BD. Chứng minh rằng DE=EF=FB. c) Biết diện tích hình bình hành ABCD bằng 48cm2. Tính diện tích hình bình hành AICJ.

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