1, birthday / my / on / December / is / 13^th .

\(\Rightarrow\) My birthday is on 13^th December .

2, when / mother's / is / your / birthday / ?

\(\Rightarrow\) When is your mother's birthday ?

3, My / birthday / mother's / in /is / September

\(\Rightarrow\) My mother's birthday is in September .

4, Why / you / do / want / English / to /learn / well / ?

\(\Rightarrow\) Why do you want to learn English well ?

a)đúng

b)sai

c)sai

tick nha

Đung rôi đo thây Phynit , nghe cÁCH an nói là biêt liên .

\(5^{x+1}+6.5^{x+1}=875=>5^{x+1}\left(1+6\right)=875=>5^{x+1}=875:7=125=5^3\)

=>x+1=3

=>x=2

@Le Huynh Bao Ngoc

Là trả loi tin nhan đo bạn ! , rep thÔi !