Cho ΔABC vuông tại A, có AB=6 cm, AC=8 cm.BD là phân giác của góc ABC. a, Tính số đo các cạnh BC,DA,DC b,Kẻ đường cao AH. Tính số đo AH? c,Chứng minh AC²=CH.BC d,Tính $\frac{S_{AHC}}{S_{ABC}}$

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Ex 7: Write the questions and answer Why…? and because: e.g: Minh/ have a toothache/ a lot of candies. - Why does Minh have a toothache? – Because he ate a lot of candies. 1.she/ be worried/ see dentist. ………………………………………………… Ba/ be scared/ sound of the drill. …………………………………………………………………………………………………………………….…………………………………………………………………………………………………… He/ feel calm/ dentist kind …………………………………………………………………………………………………………………….…………………………………………………………………………………………………… Lan/ feel better/ fix the tooth. …………………………………………………………………………………………………………………….………………………………………………………………………………………………….. Nam/ be happy/ teeth healthy. …………………………………………………………………………………………………………………….…………………………………………………………………………………………………… They/ play soccer well/ practice every day. …………………………………………………………………………………………………………………….…………………………………………………………………………………………………… Lan and Hoa/ do morning exercises every morning/ want to have a healthy life. …………………………………………………………………………………………………………………….…………………………………………………………………………………………………….