Dear Jane,

    Thank you 1 your letter. It's good that you 2 your school. I go to school 3 Monday to Friday. I have four classes in the morning 4 two classes in the afternoon. I am5 after class. On Monday and Wednesday afternoon I play volleyball for 6 hours. On Tuesday afternoon 7 of us have a singing class. And on Thursday afternoon some 8 computer class. On Friday afternoon I learn to speak English 9 my English teacher. On Saturdays and Sundays I don't go to school. I am often with 10 father and mother.

Love,

Lin Mei

已知函数y=f(x)的定义域为R，当x<0时，f(x)>1，且对任意的实数$x,y\in$R，等式f(x)f(y)=f(x+y)成立．若数列{a_n}满足a₁=f(0)，且$f\left(a_{n+1}\right)=\frac{1}{f(-2-a_n)},\left(n\in N^{+}\right)$ ，则a₂₀₁₂的值为（      ）