Question

Dbdbrbr

Answer 1

60°

Answer 2

Có : `\hat{A}+\hat{B}=180^o` ( 2 góc phụ nhau )

`->2\hat{B}+\hat{B}=180^o`

`->3\hat{B}=180^o`

`->\hat{B}=60^o`

 

Answer 3

B

Answer 4

Có : `\hat{A}+\hat{B}=90^o` ( 2 góc phụ nhau )

`->2\hat{B}+\hat{B}=90^o`

`->3\hat{B}=90^o`

`->\hat{B}=30^o`

Answer 5

Chọn C

Answer 6

60^o