gíup mk vs
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Gíup vs
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6 tháng 9 2018
Ta có:
OC nằm giữa OA và OB
\(\widehat{AOC}+\widehat{COB}=\widehat{AOB}\)
Ta lại có:
\(30^o+\widehat{COB}=120^o\)
\(\Rightarrow\widehat{COB}=120^o-30^o\)
\(\widehat{COB}=90^o\)
\(\Rightarrow OB\perp OC\)
=> ĐPCM
1.It takes me half an hour to get to work
2.Is this the cheapest computer you have?
3.How much does this dictionary cost?
5.Tom's collection has over eight hundred stamps
8.Như câu 1
9.Như câu 5
10.What terrible weather!
1.It takes me half an hour to get work
2.Is this the most expensive computer
3.How much does this dictionary cost?
4. You don't have to finish the work today
5.Tom's collection have over eight hundred stamps
6.We are interested in playing football match
7.You don't have as more books as me
8.It takes the boys three hours a day to learn the lessons
9.There are over 30 million books in the library contains
10.What terrible weather