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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
(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)
K
5 tháng 2 2021
Chia động từ trong ngoặc cho đúng thì:
(it/rain)....did it rain....yesterday?
No,it didn't.
giải nhanh hộ mình với mình đang cần
6 tháng 5 2022
2. You didn't remember turning off the TV last night, did you?
3. The countryside suffers much less pollution than the city.
4. Why don't you go to work by bike?
6. More trees will be planted along this street.
7. Overpopulation causes a lot of social problems in this area, doesn't it?
8. Pollution is the most serious problem, isn't it?
9. Did a group of foreigners visit slums last week?
câu 1, 5, 10 thấy đã làm rồi nên mình không có làm lại nha.
6 tháng 5 2022
2. You didn't remember turning off the TV last night, did you?
3. The countryside suffers much less pollution than the city.
4. Why don't you go to work by bike?
6. More trees will be planted along this street.
7. Overpopulation causes a lot of social problems in this area, doesn't it?
8. Pollution is the most serious problem, isn't it?
9. Did a group of foreigners visit slums last week?
KY
2 tháng 2 2023
we need to get a sack of rice and a tin of tuna
Thousands of tourists visit Nga Bay Floating Market every day
First heat the water about 15 minutes then let it simmer over the low heat
You must spend more time for preparing your chemistry test
You shouldn't talk when the teacher is teaching
Nancy used to play the guitar very well but she doesn't play it anymore
I love acting I'm a member of my school drama club
DT
Đỗ Thanh Hải
CTVVIP
29 tháng 3 2021
bài 1 2 khó nhìn quá
Bài 3
1 cultural
2 colored
3 celebrations
4 traditional
5 celebrated
6 entertainment
7 excitement
8 beginning
có cần vội quá không bạn
1 the homework was done by Jack
2 the floor was scrubbed by the women
3 some of the tables will be moved by we
4 the vegetables was grown by the farmers
5 new dress will be bring to me by she
6 the kick was felt by john
7 my back was rubed by my mother
8 the information was broadcasted bykayla and george
9 you will be driven to your home by me
10 their kites was flew by they last week
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