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china2509
2 năm trước
Chào mng cho mình hỏi là tại sao khi phân tích đa thức bằng cách đặt nhân tử chung thì nên chọn ƯCLN cho phần hệ số và biến lấy số mũ nhỏ nhất vậy ạ tại sao ko phải là BCNN em cảm ơn.
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1Ann is very tired . she _____ tennis for three hours A:is playing B:will play C:plays D:has been playing 2 he works in a bank, but he ______ it very much A:doesn't enjoy B:haven't enjoy C:đin't enjoy D:hadn't enjoy 3 I ____ well lattely.Mabe I should go to the doctor A: didn't feel B:won't feel C:haven't been fee;ing D:am not feeling 4 I _____ my homework for two hours,but I ____ yet A:have done-haven't finished B:is doing-isn't finishing C:will dp-will not finish D:have been doing-haven't finished 5let's take our travel chess set in case wwe _____ bored on the train A:Get B:are getting C:got D:have got 6 we ____ get in touch with our customers by post A:recently B:hardly C:lately D:latterly 7 We have been married ______ A:over twenty years B:over twenty years ago C:for over twenty years D:since over twenty years 8 melanie ______- her hand. It's bleeding heavily A:has cut B:is cutting C:cut D:cuts 9" when will Mary be able to leave hosptal?" - "Don't be so impatien. we cannot realease her before we ________ the last test A:have complete B:will have completed C:will complete D:completed 10 The Amazon river____ into the Atlantic Ocean A:flows B:has flowed C:is flowing D:will flow 11 My parents live in London. They _______ there all their lives A:are living B:had lived C:have lived D:will live 12 where have you been? I ____ for you the last half hour A:am looking B:have been looking C:will be looking D:look 13 My brother is an actor. He ______ in several movies A:appeared B:had appeared C:has appeared D:appears 14 Please don't bother hom now. he ________ A:is working B:has been working C:had been working D:was working 15 I _______ an interesting book at the moment. I will lend it to you when I ____ it A:am reading - have finished B:read - am finishing C:have read - am finishing D:read -will finish 16 Ha never ______ fishing in the winner but she always ___-it in the summer A:goes-does B:has gone - done C:go - do D: was gone - done 17 we can win only if we remain united, so we must suppor them the moment they_____ on strike A:will have gone B:will go C:go D:went 18 I am sr . i ______ that fellow's name already A:forgot B:have forgotten C:have been forgetting D:forget 19It usually ______ very much in that part of the United States A:is rainning B:rained C:rains D:have rained 20 look! A man _____ after the train. he wants to catch it A:runs B:have been running C:will run D:is running

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