So bquan +gdon dac biet

S bq + gian don la so bquan dc tih tren co so bquan hoa cac luog bien trong 1 tong the,tongdo cac luongbien khacnhau chi xhien 1 lan,trong khi do ...+gia quyen dc tih trong trhop co it nhat 1 luong bien xhien nhieu hon 1 lan trong tong the

-noi...dac biet la vi

+deu tinh =cach dem tong cac luong bien cua tieu thuc chia cho tong so dvi tog the

+dkien van dung:deu fai dc tinh rat u tong the dong chat,vandung ket hop voi so bquan to va day so ph2

+mat khac,..+gdon lai la su van dung khac biet of ...gia quyen .cac luong bien khac nhau chi xhien 1 lan o so bquan +gian don ,trog khi o so bquan cong gia quyen co it nhat 1 luong bien xh>1 lan o tong the

Cm=cthuc