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cho tam giác ABC có AB<AC. Gọi M là trung điểm của BC. Chứng minh AC-AB/2<AM<AC+AB/2

Mọi người giúp mik câu b thôi ạ

Ai giúp em môn tiếng anh với ạ em đang bí

Cho hình thang ABCD (AB//CD) và AB<CD. Gọi I, K, E lần lượt là trung điểm của BD, AC, BC. a)Chứng minh: 3 điểm I, K, E thẳng hàng. b)Chứng minh:IK =CD - AB / 2

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giúp em nhanh ạ 3h30 hạn chót ạ em cảm ơn nhiều lắm ạ

91, He is a slower and more careful driver than Lan. He drives ……………………………………………………………………………. 92, The visitor spoke too quickly that I couldn’t understand what he said. The visitor spoke too ……………………………………………………………….. 93. Lan is more intelligent than her sister. -> Lan’s sister isn’t .............................................................................................................. 94. He looks after the sick people. -> He takes ........................................................................................................................... 95. Do you enjoy listening to music? -> Are you interested ..........................................................................................................? 96. What is your mother’s job? -> What does .......................................................................................................................? 97. We have a two - month summer vacation. -> Our summer vacation lasts .............................................................................................. 98. Remember to write a letter to me. -> Don’t …………………………………………………………………………………… 99. Vietnamese students have fewer vacations than American ones. -> American students ........................................................................................................... 100. It takes me about two hours each day to do my homework. -> I spend .............................................................................................................................. 101. Hoa is a hard student. -> Hoa studies .......................................................................................................................

giúp mk chọn vs cảm ơn các bn trc nha nhanh nhé

bội chung lớn nhất của 21 và 49