cac anh chi cho em biet so nguyen to la gi

cac anh chi cho em biet so chinh phuong la gi a

tim so tu nhien co 2chu so biet rang neu viet them chu so 3 vao ben trai so do ta duoc so moi co 3 chu so va khi chia so moi nay cho so ban dau ta duoc thuong la 11du 10

giup minh voi cac ban 

cam on cac ban nhieu

Cho bieu thuc B= 7/ n -7

a) So nguyen n phai co dieu kien gi de B la phan so.

b) Tim phan so B biet n = -7

c) Tim cac so nguyen n de B la so nguyen.

bn nao co loi giai chi tiet bai nay mk se tick,vi mk  dung dien thoai ko viet dau dc nen cac ban  thong cam nha.

Cho truoc n diem trong do ko co 3 diem nao thang hang.Ve cac duong thang di qua cac cap diem,Tim n biet rang neu co them 1 diem(ko thang hang voi bat ki 2 diem nao trong so n diem da cho) thi so duong thang ve duoc tang them la 8.

Minh dang can gap!Cac ban giup minh voi nhe!

so 1221 doc xuoi (tu trai qua phai) va doc nguoi (tu phai qua trai) deu la 1 con so .Con rat nhieu so co 4 chu so co tinh chat doi xung nhu vay .Tinh tong tat ca cac so doi xung co 4 chu so

giup minh voi

cho 1 so tu nhien  co 2 chu so . Biet rang tong cac so tu nhien lien tiep bat dau tu den  so nay la 1 so ma 2 chu so tan cung cua no bang chinh so so co 2 chu so ban dau . tim so ban dau

trinh bay cach giai nhu the nao day cac ban giup minh voi