Đáp án + Giải thích các bước giải:
a) Ta có: $∠BAC=∠ACd=70^0$
Mà cùng ở vị trí so le trong
$⇒AB//CD(1)$
b)Ta có: $AB⊥BF;EF⊥BF$$⇒AB//EF(2)$
c) $Từ (1),(2)⇒EF//CD$
MK xin hay nhất ạ
Đáp án+Giải thích các bước giải:
`a)\hat{A_1}=\hat{C_1}=70^0`$\\\text{Mà cùng ở vị trí so le trong}$$\\$`=>`$AB//CD$
`b){:(AB⊥BF),(EF⊥BF):}}=>`$AB//EF$
$c)Vì\ \left.\begin{matrix} AB//CD\\ AB//EF \end{matrix}\right\}$`=>`$EF//CD$
Các bạn ơi , giúp mk với , mk cần gấp
Mng giúp em với ạ vẽ hình hộ em luôn ak
II.Rewrite sentences without changing the meaning 1. “Can I borrow your ruler, Lan?” asked Viet. A. Lan asked Viet if Viet could lend her his ruler. B. Viet asked whether he could borrow Lan’s ruler. C. Viet wanted to lend Lan his ruler. D. Lan wanted to borrow Viet’s ruler. 2.He hasn’t got his hair cut for two months. A. It has been two months since the last time he got his hair cut. B. He will never get his hair cut again. C. Getting his hair cut is expensive. D. He is so lazy to get his hair cut. 3. What are you going to do next summer?" she asked. A. She asked us what we were going to do the following summer. B. She asked us what I was going to do the following summer. C. She asked us what were we going to do the following summer. D. She asked us what we was going to do the following summer. 4.People use a lot of vehicles. The air is polluted. A. If people don’t use too many vehicles, the air won’t be polluted. B. If people won’t use too many vehicles, the air don’t be polluted. C. If people wouldn’t use too many vehicles, the air didn’t be polluted. D. If people didn’t use too many vehicles, the air wouldn’t be polluted. 5.Because the storm is getting bad, you shouldn’t go out A. The storm is getting bad, so you shouldn’t go out. B. The storm is getting bad, but you shouldn’t go out. C. The storm is getting bad, for you shouldn’t go out. D. The storm is getting bad, or you shouldn’t go out 6.To communicate face-to-face is more convenient than to interact online. A. It’s more convenient to interact online. B. It’s more convenient to communicate face-to-face. C. It’s less convenient to interact online. D. It’s less convenient to communicate face-to-face. III.Rearrange the sentences to make meaningful sentences 1. What/ pollution/ to/ is/ types/ the/ of/ most/ human/ harmful? A. What pollution of types is the most harmful to human? B. What types of pollution is the most harmful to human? C. What the most types of pollution is harmful to human? D. What is types of pollution harmful the most to human? 2.What/ to/ should/ help/ we/ homeless/ do/ people? A. What should we help to do homeless people? B. What should we do to help homeless people? C. What we should do to help homeless people? D. What we should help to do homeless people? 3.We/ should/ people/ try/ time/ to/ evacuate/ predict/ to/ in/ earthquake A. We should try to predict earthquake to evacuate people in time. B. We should predict to try earthquake to evacuate people in time. C. We should predict to try earthquake in evacuate people to time. D. We should try to predict earthquake in evacuate people to time. 4.We/ to/ called/ take/ ambulance/ to/ the/ the/ injured/ hospital/ the. A. We called the ambulance to take the injured to the hospital. B. We called the ambulance take to the injured to the hospital. C. We called the ambulance to take injured the to the hospital. D. We called the ambulance take to injured the to the hospital. 5.Nuclear/ plants/ a lot of/ don’t/ power/ require/ space. A. Nuclear power plants don’t require a lot of space. B. Nuclear power a lot of plants don’t require space. C. Nuclear power don’t require a lot of space plants. D. Nuclear plants don’t require a lot of power space. 6.We/ before/ seen/ have/ Physical/ never/ this/ experiment. A. We have never before seen this Physical experiment. B. We have never Physical experiment seen this before. C. We have seen never this Physical experiment before. D. We have never seen this Physical experiment before. 7.Jupiter/ in/ largest/ is/ solar/ the/ system/ the/ planet. A. Jupiter is the planet largest in the solar system. B. Jupiter is the largest planet in the solar system. C. Jupiter is the largest solar planet in the system. D. Jupiter is the largest planet the solar in system.
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cần gấp dùng hằng đẳng thức phân tích các đa thức sau thành nhân tử Bài 1 : 4 ( 2x - 3 ) tất cả mũ 2 - 9 ( 4x mũ 2 -9 ) tất cả mũ 2
Minh não là đỉnh núi cao nhất của nước ta hiện nay
cho a^2+b^2+c^2=ab+bc+ac.CMR:a=b=c
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