The last month of year is December

=> December is the last month of year.

1. I will be free tonight.

right

Do BI và CI là phân giác góc B và góc C của tam giác ABC

=>góc IBC + góc ICB=1/2 góc B + 1/2 góc C=1/2(góc B + góc C)

Do tam giác ABC có góc A=90⁰ =>góc B+ góc C=180⁰-90⁰=90⁰

=>1/2(góc B + góc C)=45⁰

=>góc IBC + góc ICB=45⁰

Mà góc IBC + góc ICB + góc BIC =180⁰

=>góc BIC=135⁰

1. Her friends bought picture books , but she doesn't.

2. My mother didn't watch the movie , but I didn't.

3.Hoa likes carrots , but her uncle doesn't.

4.I don't eat plenty vegetables , but my sister does.

5. We know how to use a computer , but they don't

6. My father doesn't drink coffee , but my uncles do.

7.His parents didn't eat spinach , but he did.

8.Ba does exercise every morning , but Nam doesn't