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thcschannua1
2 năm trước
cho tam giác ABC có A=90 độ và AB=AC gọi K là trung điểm của BC a,chứng minh tam giác AKB và AK vuông BC b,từ C vẽ đường thẳng vuông góc với BC cắt đường thẳng AB tại E chứng minh EC//AK c,tính^BEC làm giúp với mình cần gấp!!
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