nguyen thieu cong thanh làm đúng rùi. 

go

far

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Can you swim ? No , I can't

not

He/she is a doctor.

\(\frac{x+1}{2}=\frac{8}{x+1}\Rightarrow\left(x+1\right)\left(x+1\right)=2.8\Rightarrow\left(x+1\right)^2=16\)

=>x+1=4 hoặc -4

=>x=3 hoặc -5

vậy x=-5;3

mình thích. **** cho mình nhá

She often sings songs in front of her classmates.