sO HANG THU NHAT LA
(385 - 38 ) / 2=173,5
SO HANG THU HAI LA
173,5 +38=211,5
NEU TANG SO HANG THU NHAT 62 DON VI THI SO HANG THU NHAT LA
173,5+62=235,5
NEU GIAM SO HANG THU HAI DI 38 DON VI THI SO HANG THU HAI KHI DO LA
211,5-38=173,5
TONG HAI SO HANG KHI DO LA
235,5+173,5=409