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a: Xét ΔAMD và ΔCMB có

MA=MC

\(\widehat{AMD}=\widehat{CMB}\)

MD=MB

Do đó: ΔAMD=ΔCMB

b: Xét ΔMAB và ΔMCD có

MA=MC

\(\widehat{AMB}=\widehat{CMD}\)(hai góc đối đỉnh)

MB=MD

Do đó: ΔMAB=ΔMCD
=>AB=CD

ΔMAB=ΔMCD

=>\(\widehat{MAB}=\widehat{MCD}\)

=>AB//CD

c: TA có: \(AN=\dfrac{AB}{2}\)

\(CE=\dfrac{CD}{2}\)

mà AB=CD

nên AN=CE

Xét ΔMAN và ΔMCE có

MA=MC

\(\widehat{MAN}=\widehat{MCE}\)

AN=CE
DO đó: ΔMAN=ΔMCE

=>\(\widehat{AMN}=\widehat{CME}\)

mà \(\widehat{AMN}+\widehat{NMC}=180^0\)(hai góc kề bù)

nên \(\widehat{CME}+\widehat{NMC}=180^0\)

=>N,M,E thẳng hàng

mà NM=ME(ΔMAN=ΔMCE)

nên M là trung điểm của NE

a: Xét ΔABH vuông tại H và ΔACH vuông tại H có

AB=AC

AH chung

Do đó: ΔABH=ΔACH

=>\(\widehat{BAH}=\widehat{CAH}\)

=>AH là phân giác của góc BAC

b:

ΔAHB=ΔAHC

=>HB=HC

Xét ΔHMB vuông tại M và ΔHNC vuông tại N có

HB=HC

\(\widehat{HBM}=\widehat{HCN}\)

Do đó: ΔHMB=ΔHNC

=>HM=HN và \(\widehat{MHB}=\widehat{NHC}\)

c: Xét ΔHNC và ΔHPC có

HN=HP

\(\widehat{NHC}=\widehat{PHC}\left(=\widehat{MHB}\right)\)

HC chung

Do đó: ΔHNC=ΔHPC

=>\(\widehat{HCP}=\widehat{HCN}\)

=>\(\widehat{HCP}=\widehat{CBA}\)

=>CP//BA

10 tháng 5 2024

caanf câu 2 đến hết tự luận à bn

11 tháng 5 2024

từ phần tự luận thôi ạ

 

a: Xét ΔABC có AB<AC<BC

mà \(\widehat{ACB};\widehat{ABC};\widehat{BAC}\) lần lượt là góc đối diện của các cạnh AB,AC,BC

nên \(\widehat{ACB}< \widehat{ABC}< \widehat{BAC}\)

b: Xét ΔBAD vuông tại A và ΔBED vuông tại E có

BD chung

\(\widehat{ABD}=\widehat{EBD}\)

Do đó: ΔBAD=ΔBED

=>DA=DE

c: Xét ΔDAF vuông tại A và ΔDEC vuông tại E có

DA=DE

\(\widehat{ADF}=\widehat{EDC}\)(hai góc đối đỉnh)

Do đó: ΔDAF=ΔDEC
=>DF=DC

mà DC>DE(ΔDEC vuông tại E)

nên DF>DE

Part 2: Rewrite the second sentence so that it has a similar meaning to the first one. 1. My house is small and old. Your house is spacious and modern. (different) ………………………………………………………………………………………………………………… 2.According to the rules, it’s necessary for students to hand in their assignments on time. (have...
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Part 2: Rewrite the second sentence so that it has a similar meaning to the first one.

1. My house is small and old. Your house is spacious and modern. (different)

…………………………………………………………………………………………………………………

2.According to the rules, it’s necessary for students to hand in their assignments on time. (have to)

…………………………………………………………………………………………………………………

3. There are recycling bins in our apartment block, but some people still don’t bother to separate plastic and paper. (Although)

………………………………………………………………………………………………..

4. Canada gets 25% of its energy from hydropower and 3.5% from coal. (more)

………………………………………………………………………………………………..

5. I am nervous. I am going to receive the exam results tomorrow. (because)

………………………………………………………………………………………………..

6. Ivy studied a lot for her biology test. However, she didn’t pass it. (Although)

→ ………………………………………………………………………………………………..

7. Both Vietnamese and Chinese people give children lucky money on Lunar New Year. (like)

mình cần gấp!!!!!!!!!!!!!

1
12 tháng 5 2024

1. My house is small and old. Your house is spacious and modern. (different)

…………………………………………………………………………………………………………………

2.According to the rules, it’s necessary for students to hand in their assignments on time. (have to)

……According to the rules, students have to hand in their assignments on time……………………………………………………………………………………………………………

3. There are recycling bins in our apartment block, but some people still don’t bother to separate plastic and paper. (Although)

→ …Although there are recycling bins in our apartment block, some people still don't bother to seperate plastic and paper……………………………………………………………………………………………..

4. Canada gets 25% of its energy from hydropower and 3.5% from coal. (more)

→ ………Canada gets more energy from hydropower than from coal………………………………………………………………………………………..

5. I am nervous. I am going to receive the exam results tomorrow. (because)

→ …I am nervous because I am going to receive the exam results tomorrow……………………………………………………………………………………………..

6. Ivy studied a lot for her biology test. However, she didn’t pass it. (Although)

→ ………Although Ivy studied a lot for her biology test, she didn't pass it………………………………………………………………………………………..

7. Both Vietnamese and Chinese people give children lucky money on Lunar New Year. (like)

Like Chinese people, Vietnamese people give children lucky money on Lunar New Year