Cho hình bình hành ABCD . Gọi K,I lần lượt là trung điểm của cạnh AB , CD . Đường chèo BD cắt AI ở M và cắt CK ở N . Chứng minh : a,AI //KC ; AI=KC . b,∆ADM =∆CBN c,KMIN;AMCN là các hình bình hành d,DM =MN=NB. Giúp mk vs nhaaa!!!

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