C nha

Hình một đâu vậy em :v?

Tham khảo nhe =)) 

Dùng những từ gợi ý sau để viết các câu hoàn chỉnh.

1. I/ receive/ letter/ uncle/ last week

==>I received a letter from my uncle last week.

2. yesterday/ doctor/ tell/ Hoa/ not/ forget/ brush/ teeth/ every day.

==>Yesterday,the doctor told Hoa not to forget to brush her teeth everyday.

3. I/ tell/ classmates/ my trip/ Tri Nguyen Aquarium/ Nha Trang.

==>I told my classmates about my trip in Tri Nguyen Aquarium in Nha Trang.

4.Yesterday/ I/ toothache/ so/ I/ go/see/ dentist

==>Yesterday I had a tooache so I went to see the dentist.

5. Dentist/ check/his teeth/ and/ tell/ him/not/ worry.

==>Dentist checked his teeth and told him no to worry.

6. She/ always/ get up/ early/ do morning exercises.

==>She always gets up early to do morning exercises.

7. Yesterday/ Minh/ feel/ less/ scared/ after/ Dr. Lai/ check/ his teeth.

==>Yesterday Minh felt less scared after Dr.lai checked his teeth.

8. Tam/ look/ tired/ because/ she/ stay/ late/ last night.

==>Tom looked tired because she stayed late last night.

1. I/ receive/ letter/ uncle/ last week

=>I received a letter from my uncle last week.

2. yesterday/ doctor/ tell/ Hoa/ not/ forget/ brush/ teeth/ every day.

=>Yesterday,the doctor told Hoa not to forget to brush her teeth everyday.

3. I/ tell/ classmates/ my trip/ Tri Nguyen Aquarium/ Nha Trang.

=>I told my classmates about my trip in Tri Nguyen Aquarium in Nha Trang.

4.Yesterday/ I/ toothache/ so/ I/ go/see/ dentist

=>Yesterday I had a tooache so I went to see the dentist.

5. Dentist/ check/his teeth/ and/ tell/ him/not/ worry.

=>Dentist checked his teeth and told him no to worry.

6. She/ always/ get up/ early/ do morning exercises.

=>She always gets up early to do morning exercises.

7. Yesterday/ Minh/ feel/ less/ scared/ after/ Dr. Lai/ check/ his teeth.

=>Yesterday Minh felt less scared after Dr.lai checked his teeth.

8. Tam/ look/ tired/ because/ she/ stay/ late/ last night.

=>Tom looked tired because she stayed late last night.

Kẻ AH⊥BC

ta có: \(VP=AB^2+BC^2-2.AB.BC.cosB=AB^2+BC^2-2.AB.BC.\dfrac{BH}{AB}=AB^2+BC^2-2.BH.BC=AB^2-BH^2+BC^2-2.BH.BC+BH^2=AH^2+\left(BC-BH\right)^2=AH^2+CH^2=AC^2=VT\)

a: gọi d=ƯCLN(n+4;n+5)

=>\(\left\{{}\begin{matrix}n+5⋮d\\n+4⋮d\end{matrix}\right.\)

=>\(n+5-n-4⋮d\)

=>\(1⋮d\)

=>d=1

b: gọi d=ƯCLN(2n+3;2n+1)

=>\(\left\{{}\begin{matrix}2n+3⋮d\\2n+1⋮d\end{matrix}\right.\)

=>\(2n+3-2n-1⋮d\)

=>\(2⋮d\)

mà 2n+3 lẻ

nên d=1

Kiểu này là thi òi:)

Mik thi như này nhìu nên bít:>

a: 

Input: a=20

Output: a*a

She does not go to school at 8 o'clock
He does not have dinner at 9 o'clock
She does not go to bed at 7 o'clock
He does not go home at 4 o'clock
He does not go to bed at 9 o'clock

a: =>x-4=0 hoặc x+5=0

=>x=4 hoặc x=-5

b: =>39/7:x=13

hay x=3/7

c: \(\Leftrightarrow\left(4.5-2x\right)=\dfrac{11}{4}:\dfrac{4}{9}=\dfrac{99}{16}\)

\(\Leftrightarrow2x=-\dfrac{27}{16}\)

hay x=-27/32

d: \(\Leftrightarrow x\cdot\dfrac{19}{15}=684\)

hay x=540

a. \(\left[{}\begin{matrix}x-4=0\\x+5=0\end{matrix}\right.\)

\(\Leftrightarrow\left[{}\begin{matrix}x=4\\x=-5\end{matrix}\right.\)

b.\(\Leftrightarrow\dfrac{39}{7}:x=13\)

\(\Leftrightarrow x=13.\dfrac{39}{7}\)

\(\Leftrightarrow x=\dfrac{507}{7}\)

c.\(\Leftrightarrow4,5-2x=\dfrac{99}{16}\)

\(\Leftrightarrow-2x=\dfrac{27}{16}\)

\(\Leftrightarrow x=-\dfrac{27}{32}\)