cho tam giác ABC có AB nhỏ hơn AC. Tia phân giác của A cắt đường trung trực của BC tại I . Kẻ IH vuông góc với AB, H thuộc AB, Kẻ IK vuông góc với BC, K thuộc AC CMR: a) IB = IC b) AH=AK c) BH=CK GIÚP E VỚI Ạ !!!!!

Các câu hỏi liên quan

Rewrite the sentence without changing its meaning (5POINTS). 1. My brother stopped working in this factory last month → My brother hasn’t ................................................................................................................... 2. Maria stopped planting flowers 10 years ago → Maria hasn’t ............................................................................................................................ 3. Ba started building this hotel a year ago. → Ba has… ................................................................................................................................ 4. She stopped playing volleyball a year ago → She hasn’t .............................................................................................................................. 5. We began listening to music at 4pm → We have… .............................................................................................................................. 6. I left there last month → I haven’t ................................................................................................................................. 7. When did you live here? → How long ...............................................................................................................................? 8. When did you know her? → How long ...............................................................................................................................? 9. How long have you written this book? → When ....................................................................................................................................? 10. Ba has worked in this factory since he was 18 → Ba started ..............................................................................................................................? Choose the word whose part is pronounced differently from the other in each group. (1 point) 11. a. books b. likes c. reads d. stops 12. a. listened b. stopped c. traveled d. repaired Write the correct form of the verbs in the parentheses. 13. These waiters (live) here for a year. 14. She (learn) English since 1990. 15. He (live) in London for two years. 16. He ever (eat) this kind of food? 17. We (be) to Ho Chi Minh city several times. 18. You (do) your homework yet? 19 They already (sell) their car. 20 You (do) your homework yet?