Cho tam giác ABC có góc A nhỏ hơn 120 độ. dựng ngoài tam giác ấy các tam giác đều ABD và ACE a, CM: BE=CD b,Gọi I là giao điểm của BE và CD . tính góc BIC c, chứng minh rằng IA+IB=ID d,Chứng minh góc AIB=góc BIC=góc AIC=120 độ Các bạn giúp mình với ạ! Mk đang cần gấp ạ

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