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hdgm2003
2 năm trước
cho tam giác ABC cân tại A có AB=AC=5cm,BC=8cm .kẻ đường chân phân giác AD a, chứng minh AD vuông góc BC b,chứng minh tam giác ABD=tam giác ACD c,tính độ dài AD gọi e và f là chân đường vuông góc kẻ từ d đến abvà ác.chứng minh HE=HF GIÚP MÌNH VỚI Ạ MAI MÌNH THÌ RỒI
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