kiem hai diem bieu do nay
* bieu do tron
su dung khi de bai cho co chu co cau hoac ti trong(chi ap dung voi hai nam thoi nha ba nam la mien do)
de ve bieu do chuan xac truoc het phai cong tong tat ca cac so lieu thanh phan xem co bang tong so ho
co hai truobg hop
-truong hop mot tong cac thanh phan bang tong so
tinh ti le phan tram theo cong thuc roi ve luon
truong hop hai
co the cong tong cac thanh phan da cho ko bang tong so
thi phan con thieu do se bang tong so-tong cac thanh phan
phan do co the dat la :cac thanh phan kinh te khac
+cac vung khac
+tuy theo de cho ve cai gi roi dien vao phan do
-de biet ve bieu do nam truoc co kich thuoc so voi nam sau the nao ne
+so sanh tong so nam truoc va nam sau
+nam truoc < nam sau=>bieu do nam sau lon hon nam truoc
+nam truoc > nam sau=>bieu do nam sau nho hon
con muon ve chinh xac tuyet doi co conh thuc ne:nam sau tru nam truoc (neu nam sau lon hon nam truoc neu ko lam nguoc lai)roi can bac hai no len ,lay ban kinh cua nam truoc nhan voi cai so vua lay can xong do nhan voi nhau la tim duoc ban kinh nam sau
+luu y:bieu do duoc ce tu so 12 theo chieu kim dong ho
*con vai bieu do nua ki sau dua len cho ma tham khao
ma cac ban sao ko ai viet bai het vay
viey di chia se cam xuxc .chia se kien thuc cung chung niem vui