cho tam giac ABC ⊥ tai A co AB=AC.Lay Dϵ canh AB;Eϵ canh AC/AD=AE.Duong thang di qua D va ⊥ BE cat duong thang CA o K.C/m:AK=AC

tim x,y,z biet

\(\dfrac{x}{y}\) =\(\dfrac{3}{2}\) ; \(\dfrac{y}{z}\) = \(\dfrac{5}{7}\) va ^{_{\(|2x-3y+5z|\) =1}}

Tim x,y,z biet:

\(\dfrac{2x}{3}\) = \(\dfrac{3y}{4}\) = \(\dfrac{4z}{5}\) va -x-y-z=-49

Write an informal letter(60-70 world) to invite your friend to go to a music club, using the given information.

Event: music club

Place: 100 Hai Ba Trung

Time: 8.00 pm Saturday, 5th December

Time to meet: 7.30 pm

Place to meet: outside the club

Dear Nam,.......................................................................................

HAY GIUP MINH NHE!

Luu y: khong chep mang nhe!

Tim cac so x,y,z biet rang x:y:z = 12:9:5 va xyz = 20

CAM ON CAC BAN NHE!

Dan bai cua bai:"Hay nhap vai En-ri-co viet mot la thu xin loi me sau khi nhan duoc la thu cua nguoi cha.

CAM ON CAC BAN. HAY GIUP MINH NHE!