N
nc_nc


co ai ko?khao sat giup to cai nay!y=x^2/(1-x)@-)
giup to voi!cai nay tim co moi mot tiem can!chang hieu ve kieu j nhi?to dang ban khoan i!!!giup to voi nhe!!!
giup to voi!cai nay tim co moi mot tiem can!chang hieu ve kieu j nhi?to dang ban khoan i!!!giup to voi nhe!!!