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l.j.ntbn
2 năm trước
giải hộ mình nha tối nay nộp rùi Bài 1: cho Δ ABC vuông tại A ,AH vuông vs BC ,BH=3,6cm,góc B =30 độ a, Tính AH , CH b,Tính AB × sinC + BC ×cosB Bài 2:cho Δ ABD vuông tại A,AB= 6cm ,AC=8cm AM: đường cao a, tính MB,MD,MA b,qua B kẻ Bx song song vs AD Bx ∩ AM={c} c/m AM ×AC=BM ×BD
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