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giúp mik với
TG
3
11 tháng 11 2018
+ ΔAHB và ΔCKD có
HB = KD (=1)
góc AHB = góc CKD(=90º)
AH = CK (=3).
⇒ ΔAHB = ΔCKD(c.g.c)
⇒AB = CD (hai cạnh tương ứng)
+ ΔCEB và ΔAFD có
BE = DF (=2)
góc BEC = góc DFA (=90º)
CE = AF (=4).
⇒ ΔCEB = ΔAFD ( c.g.c)
⇒ BC = AD (hai cạnh tương ứng)
b) ΔABD và ΔCDB có
AB = CD
AD = BC
BD cạnh chung
⇒ ΔABD = ΔCDB (c.c.c)
⇒ góc ABD = góc CDB (hai góc tương ứng)
Vậy AB // CD ( hai gó so le trong bằng nhau )
k minh nha
11 tháng 11 2018
A B C D E F M N
(hình hơi xấu, thông cảm nha)
a) Xét \(\Delta AEB\)và \(\Delta DFC\) có:
AE = DF
\(\widehat{AEB}=\widehat{DFC}=90^o\)
BE = CF
Do đó: \(\Delta AEB=\Delta DFC\) (c.g.c)
Suy ra: AB = DC (đpcm)
Xét \(\Delta BMC\) và \(\Delta DNA\) có:
MC = NA
\(\widehat{BMC}=\widehat{DNA}=90^o\)
BM = DN
Do đó: \(\Delta BMC=\Delta DNA\)
Suy ra: BC = AD (đpcm)
b) Xét \(\Delta ABD\) và \(\Delta CDB\) có:
AB = CD (câu a)
BC = AD (câu a)
BD là cạnh chung
Do đó: \(\Delta ABD=\Delta CDB\) (c.c.c)
Suy ra: \(\widehat{ABD}=\widehat{CDB}\) (so le trong)
=> AB // CD (đpcm)
LA
23 tháng 2 2017
A.PHONETICS
1.
1. A. animation
2. D. sign
3. C. vehicle
4. D. naked
5. C. wanted
2.
/t/: watched, walked, brushed, washed, danced
/d/: amazed, terrified, cleaned, bored, lived
/id/: acted, needed, waited, departed, disappointed
B. VOCABULARY & GRAMMAR
1.
1. A. cinema
2. D. audience
3. A. frightening
4. D. animation
5. C. feeling
2.
1. D. animation
2. C. action
3. D. boring
4. B. surprised
3.
1. C. Although
2. A. Although
3. C. Although
4. B. in spite of
5. D. Despite
6. D. exciting
7. B. terrified
8. A. characters
9. C. boring
10. C. interested
11 tháng 10 2016
EX3: 1 VÀ 5 .Help them have a have a good meal.
2.Help people to find the correct bus, train and get to the place they want to go to.
3. Help them not be cold in the winter, not have a flu.
4. Help them have the good knowledge to get a good job and life.
EX4:
I used to tutoring children from poor familles in HCMC. I would like to try “Volunteering to gi ve information in bus station and railway stations, offering coupons for free chicken noodle soup for the poor, giving away warm clothes to homeless people and offering meal at 5,000 VND for the poor”. I want to do because I want to help the poor people.
12 tháng 8 2016
Bài 1 :
1. was
2. got
3.did
4.took
5.combed
6.had
7.ate
8.drank
9.helped
10.brushed
11.put
12.went
13.had
14. returned
15.did
16.ate
17.took
18.was
19.came
20.went
Trả lời câu hỏi :
1.It was Sunday
2.He got up at six
3.After breakfast , he helped his mother clean the table
4.He had lunch with his grandparents
5.He had dinner at 6.30
6.He went to bed at ten o ' clock
29 tháng 8 2016
1. Who are you staying with?
2. Where do you live?
3. Where is Micheal from?
4. Why is Hung unhappy?
5. Is Lan from Da Nang?
6. How old are they?
7. What is your new classmate's name?
8. How does your father go to work?
9. Who is our teacher talking to?
10. How far is it from your house to school?
DM
29 tháng 8 2016
1. who are you staying with?
2. where do you live?
3. where is Michael from?
4. why is Hung unhappy?
5. is Lan from Da Nang?
6.How old are they?
7. what is your new classmate's name?
8. how does your father go to work?
9. who is your teacher talking to?
10. how far is it from your house to school?
12 tháng 8 2016
Bài 2 :
1. am
2.doesn't study
3.don't
4.has
5.have
6.doesn't read
7.are .. doing
8.aren't listening
9.is siting
10.is / are playing
Bài 3 :
1.making
2.wasshes
3.doesn't
4.joining
5.do
6.aren't
7.(6) bên trái :doesn't work
8.play
12 tháng 8 2016
Bài 4 :
1.B
2.B
3.B
4.A
5.B
Bài 5:
1. What can I go to buy beef ?
2. Who does Lan go to the zoo with ?
3. How often do they go to the zoo ?
4. How long is she going to stay?
5.What does your daughters do every morning ?
NH
2
NH
1
DT
27 tháng 1 2023
1. into
2. to
3. at
4. on - in
5. with
6. to
7. above
8. with - for
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