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hongngoc8498
2 năm trước
Cho ABCD là hình thang có AB=3a, CD=a và ADC=120o. Gọi M,N theo thứ tự là TĐ của AB và CD. a)Chứng minh AMND là hình thang cân. b)Gọi I là TĐ của MN, gọi giao của CI với AB là E.CMR:EMCN là hình chữ nhật và AECD là hình thoi. c)CMR:ECB vuông tại C. nhanhh vs ạ.ko google nhé
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