Có 8 tập hợp con. 

a) ta có ACB + ACx = 180

=> ACx = 180 - ACB = 180 - 40 = 140

vì Cy là tia p.giác ACx

=> ACy = yCx = \(\frac{ACx}{2}=\frac{140}{2}=70\)

ta có B = ACy = 70

và cùng ở vị triso le trong 

=> AB // Cy

b) HAC + AHC + ACy = 180

=> HAC = 180 - ( AHC + ACy)

=> HAC = 180 - ( 90 + 70 )

=> HAC = 30 

~ CHÚC BẠN HOK TỐT ~ có j ko hiểu thì hỏi lại mik nhá 

Ho Chi Minh City / have / pollution / 3.5 million

=> Ho Chi Minh City has pollution of 3.5 million

1 . I / turned / to movie channel / because / I / wanted / watch / film

=> I am turned to movie channel because I wanted to watch film

2 . She / love / football / but / she / not / want / watch / football matches / TV

=> She loves football but she doesn't want to watch football matches on Tv

3 . Although / the / film / late / I / will / see / it

=> Although the film is late but I will see it

4 . You / can / read / Harry Potter / library / or / you / can / borrow / and / read / it / home

=> You can read the Harry in the library or you can borrow ang read it at home

5 . Hollywood / full / movies studios / and / movie / starts

=> Hollywood is full with movies studios and movie stars

6 . We / hope / give / more / green / color / town / and / learn / more / group

=> We hope given more green color two and learn more with group

7 . We / raise / funds / by / collect / waste paper / and break / glass

=> We raise funds by collect and waste paper and break glass

8 . We / going / clean / lake's / banks / weekend

=> We are going to clean lake's banks on the weekend

chả biết có đúng k nx ... nếu sai cho mk sr

1 . My friends prefers doing aerobics to swimming

=> My friend likes doing aerobics than swimming

2 . Children should play outdoors

=> Children should take part in outdoors activity

3 . Ronaldo plays soccer well

=> Ronaldo is a good soccer player

4 . What was wrong with you , Mom ?

=> What was the matter with you , Mom ?

Dùng từ gợi ý viết thành câu hoàn chỉnh

1 . you / do homework / evening

=> YOU DO HOMEWORK IN THE EVENING

2 . he / watch TV / evening

=> HE WATCHES TV IN THE EVENING

3 . she / help her Mom / after school

=> SHE HELPS HER MOM AFTER SCHOOL

4 . Hung / like / chocolate

=> HUNG LIKES CHOCOLATE