Ta có

Góc A= Góc B

=> Tam giác ABC cân tại C

=> AC=BC

\(\widehat{A}+\widehat{B}+\widehat{C}=180^0\Rightarrow\widehat{C}=20^0\)

Ta biết trong một tam giác cạnh đối diện với góc lơn hơn là cạnh lớn hơn

=> AC=BC>AB

1.My father started working in this factory last week.

=>My father has.........worked in this company for a week........

2.He started living in HCM City since he was 2.

=>He has ........lived in HCM city since he was 2...........

3.He learned English when he was 18.

=>He has .........learned English since he was 18............

4.They began to work in this factory five years old.

=>They have .......worked in this factory for 5 years...............

5.My father stopped smoking two years ago.

=>My father hasn't ........smoked for two years..............

6.My sister started working in that school last month.

=>My sister has .......worked in that school for a month..................

7.They have worked in that company since 2000.

=>They started .........working in that company sinc 2000................

8.Minh hasn't visited Ha Long Bay before.

=>This is the first time Minh .........Minh visited Ha LOng Bay..............

Giúp nha.Mk tick cho.BT đội tuyển đó. Help me,please!

Gọi 3 số cần tìm là a ; b ; c

Theo đề ra ta có

\(a=\frac{3b}{4}=\frac{2c}{5}\)

=> \(\frac{a}{6}=\frac{3b}{4.6}=\frac{2c}{5.6}\)

=> \(\frac{a}{6}=\frac{b}{8}=\frac{c}{15}\)

Áp dụng tc của dãy tỉ số bằng nhau . Ta có

\(\frac{a}{6}=\frac{b}{8}=\frac{c}{15}=\frac{a+b+c}{6+8+15}=\frac{105}{29}\)

\(\Rightarrow\begin{cases}a=\frac{630}{109}\\b=\frac{840}{109}\\c=\frac{1575}{109}\end{cases}\)

cái này tui thấy ở dây roày ý

=="

motorbike

bike

bus

car

metro

train

boat 

ship

plane

mấy bn đọc kĩ đề đi

thì hiện tại tiếp diến mak

=="

1 He ......is not celebrating.............(not celebrate) his birthday.

2 .... Is Jane visiting ..................(Jane/visit) her grandmother ?

3 They........are writing......................(write) letters in the kitchen.

4 I ............am not playing......................(not play) computer games! I...............am reading..............(read) a comic.

.5 ..........Are you planing..........(you / plan) a surprise for my birthday  ?

(+) Câu 2 vs câu 5 mk nghĩ lm theo hướng đó đúng hơn

i'm not very keen.....=> C. on spaghetti !

my town is famous......=> E. for its chocolate. it's lovely!

are you interested........=> A. in collecting comics?

jack is bored.........=> B. of running. He prefers swimming.

are you afraid.........=> F. of big, black spiders 

my pizza is different.......=> D. from yours. It's got mushrooms.

câu đầu tiên có vấn đề: (-2+3b-4c)-(-2a-3b-4c0 ? tại sao ko có dấu ) lại