a: Xét tứ giác EOBM có 

\(\widehat{OBM}+\widehat{OEM}=180^0\)

Do đó: EOBM là tứ giác nội tiếp

Em tham khảo thử nha:

Cách mạng tư sản pháp đã trải qua 2 giai đoạn phát triển:

– Giai đoạn 1 : Chế độ quân chủ lập hiến ( 14/7/1789 – 10/8/1792)

– Giai đoạn 2 : Chuyên chính dân chủ cách mạng Gia cô banh (2/6/1793 – 27/7/1794)

1 me 

2 too

3 done

doing

having

4 interested

5 as to

6 standing

when

7 helping

8 too

9 such

a

10 used

11 when

12 shouldn't

13 is - cost

Tham khảo

a, Vì a//b mà a⊥AB nên b⊥AB

b, Vì a//b nên \(\widehat{CDB}+\widehat{ACD}=180^0\) (trong cùng phía)

Do đó \(\widehat{CDB}=180^0-120^0=60^0\)

c, Vì Ct là p/g nên \(\widehat{ICD}=\dfrac{1}{2}\widehat{ACD}=60^0\)

Xét tg CID có \(\widehat{CID}=180^0-\widehat{ICD}-\widehat{CDB}=180^0-60^0-60^0=60^0\)

d, Vì Dt' là p/g nên \(\widehat{BDt'}=\dfrac{1}{2}\widehat{BDy}=\dfrac{1}{2}\widehat{ACD}\left(đồng.vị\right)=60^0=\widehat{CID}\)

Mà 2 góc này ở vị trí so le trong nên Ct//Dt'

a, Vì a//b mà a⊥AB nên b⊥AB

b, Vì a//b nên ���^+���^=1800CDB+ACD=1800 (trong cùng phía)

Do đó ���^=1800−1200=600CDB=1800−1200=600

c, Vì Ct là p/g nên ���^=12���^=600ICD=21​ACD=600

Xét tg CID có ���^=1800−���^−���^=1800−600−600=600CID=1800−ICD−CDB=1800−600−600=600

d, Vì Dt' là p/g nên ���′^=12���^=12���^(đ�^ˋ��.�ị)=600=���^BDt′=21​BDy​=21​ACD(đo^ˋng.vị)=600=

8) Ta có: \(x+\dfrac{3}{2}=-\dfrac{5}{3}\)
\(\Leftrightarrow x=-\dfrac{5}{3}-\dfrac{3}{2}=\dfrac{-10}{6}-\dfrac{9}{6}\)

hay \(x=-\dfrac{19}{6}\)

Vậy: \(x=-\dfrac{19}{6}\)

10) Ta có: \(\left|x-\dfrac{1}{2}\right|+75\%=\dfrac{9}{10}\)

\(\Leftrightarrow\left|x-\dfrac{1}{2}\right|=\dfrac{3}{20}\)

\(\Leftrightarrow\left[{}\begin{matrix}x-\dfrac{1}{2}=\dfrac{3}{20}\\x-\dfrac{1}{2}=-\dfrac{3}{20}\end{matrix}\right.\Leftrightarrow\left[{}\begin{matrix}x=\dfrac{13}{20}\\x=\dfrac{7}{20}\end{matrix}\right.\)

Vậy: \(S=\left\{\dfrac{13}{20};\dfrac{7}{20}\right\}\)

11) Ta có: \(x+\dfrac{2}{3}=-\dfrac{1}{2}\)

nên \(x=-\dfrac{1}{2}-\dfrac{2}{3}=\dfrac{-3}{6}-\dfrac{4}{6}\)

hay \(x=-\dfrac{7}{6}\)

Vậy: \(S=\left\{-\dfrac{7}{6}\right\}\)

1 . i wish my mother was here to help me with my homework

2. lan said her brother often travelled abroad with her father.

3 the teacher asked mai if she bought a new calculator

4 it was very generous of john to give them 100

5 if you don't ride a bike fast, you will go to school late

6 it is very important for athletes to be in good health

7 has just made

8 were

 9 was having

10 meeting