Cho tam giác ABC cân tại A ( AB=AC) Gọi D,E lần lượt là trung điểm của AB và AC a, Chứng minh tam giác ABE = tam giác ACD b, chứng minh BE=CD c, gọi K là giao điểm của BE và CD. Chứng minh tam giác KBC cân tại K d,chứng minh AK là tia phân giác của góc BAC

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IX/ Rewrite sentences, using IF 1. Study hard and you will pass this year's exam.  ............ ................................................................................................................................................................. 2. The weather isn’t fine so we don’t go on a picnic.  ............ ................................................................................................................................................................. 3. The weather wasn’t fine so we didn’t go on a picnic.  ............ ................................................................................................................................................................. 4. The weather wasn’t fine so we stay home.  ............ ................................................................................................................................................................. 5. I don’t go to Paris, I can’t visit the Eiffel Tower.  ............ ................................................................................................................................................................. 6. I do not go because they don't invite me.  ............ ................................................................................................................................................................. 7. I don’t study hard so I often get bad result.  ............ ................................................................................................................................................................. 8. I didn’t study hard so I get bad result.  ............ ................................................................................................................................................................. 9. I didn’t go to Paris, I couldn’t visit the Eiffel Tower.  ............ ................................................................................................................................................................. 10. I did not go because they didn't invite me.  ............ ................................................................................................................................................................. 11. He sends the information we need because he gets my email.  ............ ................................................................................................................................................................. 12. He sent the information we need because he got my email.  ............ ................................................................................................................................................................. 13. He sends the information we need because he got my email.  ............ .................................................................................................................................................................