câu 1

a/2x-18x³=0

b/5x(x-2)=x-2

giúp mik nha cać bạn

tai sao la phoi phai co 3 thuy nhung la phoi trai co 2 thuy

van xin cac ban giai gium mik cau nay

Tai sao la phoi trai co 2 thuy,nhung la phoi phai co 3 thuy.

giup mik nha cac ban

vi tinh mik khong viet dau duoc

mong cac ban thong cam va tra loi giup mik

Cho tam giac ABC vuong tai A(AB<AC),duong cao AH.Goi M,N,P lan luot la trung diem cua AB,AC,BC

a)CM:ABDC la hinh chu nhat

b)Goi K la diem doi xung cua H qua M.CM :AKBH la hinh chu nhat

c)CM:MNPH la hinh thang can

d)Goi I la mot diem tran doan MK, qua A ke duong thang AO vuong goc voi IC tai O.Tinh gocHOK.

giup mik nha cac ban

mik se stick cho

that su cam on cac ban

Cho tam giac ABC vuong tai A(AB<AC),duong cao AH.Goi O la trung diem cua BC,D la diem doi xung cua A qua O.

a)CM:ABCD la hinh chu nhat

b)Tren tia doi cua tia HA lay diem K sao cho HK=HA.CM BKDC la hinh thang can

c)Goi E,F lan luot la hinh chieu cua K len BD va CD,KE cat AD tai I.

CM:DI=DK

d)Chung minh H,E,F thang hang

giup mik nha cac ban

dung sai gi mik cung stick

mik dang can gap

cam on cac ban nhieu

neu nhan xet , tinh chat cong xa paris

giup mik nha moi nguoiii

viet chuong trinh tinh dien tich va chu vi hinh:

a)tam giac

b)vuong

Cho tam giac ABC(AB<AC)duong cao AK.Goi D,E,F la trung diem cua AB,AC,BC.

a)Chung to tu giac DBFE la hinh binh hanh.

b)Chung minh tu giac DEFK la hinh thang

c)Goi H la truc tam cua tam giac ABC.M,N,P la trung diem cua cac doan HA,HB,HC.CM:MN vuong goc voi ME

d)Chung minh MF,NE,PD bang nhau va cat nhau tai trung diem cua moi duong