Bài 5:

Ta có : \(\widehat{A_1}+\widehat{A_3}=180^o\) (kề bù)

            \(100^o+\widehat{A_3}=180^o\)

            \(\widehat{A_3}=80^o\)

Ta có: \(\widehat{A_3}=\widehat{B_1}=80^o\)

            \(\widehat{A_3}\) và \(\widehat{B_1}\) ở vị trí đồng vị 

\(\Rightarrow AC//BD\)

\(\Rightarrow\widehat{C}_1=\widehat{D_1}=135^o\) (đồng vị)

\(x=135^o\)

b)

Ta có: \(\widehat{G_1}+\widehat{B_1}=180^o\left(120^o+60^o=180^o\right)\)

               \(\widehat{G_1}\) và \(\widehat{B_1}\) ở vị trí trong cùng phía

\(\Rightarrow QH//BK\)

\(\Rightarrow\widehat{H_1}=\widehat{K_1}=90^o\)(so le)

\(x=90^o\)

1 when

2 how many

3 which 

4 who

5 why

1 what is on television tonight

2 who is your favorite MC television ?

3 how much time does tina spend watching 

4 why do they like to watch cartoons ?

5 what do you like best television programme

a: BC=căn 6^2+8^2=10cm

b: Xét ΔBAI vuông tại A và ΔBHI vuông tại H có

BI chung

góc ABI=góc HBI

=>ΔBAI=ΔBHI

=>IA=IH

mà IH<IC

nên IA<IC

c: Xét ΔIAK vuông tại A và ΔIHC vuông tại H có

IA=IH

góc AIK=góc HIC

=>ΔIAK=ΔIHC

=>AK=HC

d: Xét ΔBKC có BA/AK=BH/HC

nên AH//KC

?

???

❓

Bài 1: 

a: 23,4+3,5=26,9

b: 2,3+345,78=348,08

Xvvsdush

Hêuh

theo em thì chị hoặc anh chỉ cần lấy số phút chia số góc thôi ạ

12 giờ x 60 phút chia tất cả cho 360^o

sẽ ra 1 phút tương ứng vói bao nhiêu độ

từ đó mà 7h50p cũng vậy

sai roi ban

un mình ko biết nha bạn !!! thông cảm !!! xin lỗi vì ko giúp được !! hihihihihihi !!!!!!!!

\(\left(\dfrac{1}{8}\right)^9\cdot8^9-\left(\dfrac{3}{4}-2x\right)^2=\dfrac{41}{9}-\dfrac{72^2}{36^2}\\ \Rightarrow\left(\dfrac{1}{8}\cdot8\right)^9-\left(\dfrac{3}{4}-2x\right)^2=\dfrac{41}{9}-\left(\dfrac{72}{36}\right)^2\\ \Rightarrow1^9-\left(\dfrac{3}{4}-2x\right)^2=\dfrac{41}{9}-2^2=\dfrac{5}{9}\\ \Rightarrow\left(\dfrac{3}{4}-2x\right)^2=1-\dfrac{5}{9}=\dfrac{4}{9}\\ \Rightarrow\left[{}\begin{matrix}\dfrac{3}{4}-2x=\dfrac{2}{3}\\2x-\dfrac{3}{4}=\dfrac{2}{3}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}2x=\dfrac{1}{12}\\2x=\dfrac{17}{12}\end{matrix}\right.\Rightarrow\left[{}\begin{matrix}x=\dfrac{1}{24}\\x=\dfrac{17}{24}\end{matrix}\right.\)

Today, I will tell you some things to make school greener-cleaner. Firstly, I will ask everyone not to throw rubbish in the school because it is the reason of air pollution. Secondly, I will advise everyone to plant trees and flowers in the school yard. Thirdly, I will ask my teacher to celebrate many activities to protect the environment. Finnaly, I will advise everyone not to damage trees and flowers.... If everyone try to protect the environment, the school will be greener.

- plant some trees

- don't throw trash on the street

- plant some flowers

- don't damage trees

- don't pick flowers

Mẫu ví dụ của mình. Chúc bạn học tốt !

thanks