top bi bu xuat tinh
u0110 u1ed9i S u1ecbp B uacute C u1eb7c 2
Tong hop xuat tinh
c u1eadn c u1ea3nh b uacute cu ngo aacute y u0111 iacute t li u1ebfm u0111 iacute t c u1ea1 u0111 iacute t u0111 u1ee5 s u1ee5c cu xu u1ea5t tinh
