Goi 3 canh cua tam giac lan luot la a,b,c(a,b,c la so tu nhien khac 0)
Ba chieu cao cua tam giac lan luot la x,y,z(x,y,z la cac so tu nhien khac 0)
Theo bai ra ta co
a/2=b/3=c/4
Dat a/2=b/3=c/4=k
Suy ra a=2k
b=3k
c=4k
Ta co
a*x=b*y=c*z=2S
suy ra 2k*x=3k*y=4k*z
Rut gon ta duoc 2x=3y=4z
vay x/6=y/4=z/3