biết x = a^2 - bc , y^2 = b^2 - ac , z = c^2 - ab . Cmr : ( x+y+z)(a+b+c)=ax+by+cz

biết x = a^2 - bc , y^2 = b^2 - ac , z = c^2 - ab . Cmr : ( x+y+z)(a+b+c)=ax+by+cz

Cho x= a^2 - bc ;y= b^2- ac z=c^2-ab.

CMR:( x+y+z)×(a+b+c) =ax+by+cz

Cho ax + by + cz = 0. CMR:

ax^2 + by^2 + cz^2/ bc(y-z)^2 + ca(z-x)^2 + ab(x-y)^2 = 1/a+b+c

Biet ax+by+cz=0 va a+b+c=1/2003

Tinh ax^2+by^2+cz^2   /   bc(y-z)^2+ac(x-z)^2+ab(x-y)^2

Biết x= a²- bc; y= b²- ac, z= c²- ab

Chứng minh (x+y+z).(a+b+c) = ax +by +cz

cho ax+by+cz=0 và a+b+c =2019.Tính

A=bc(x-y)^2+ac(x-z)^2+ab(x-y)^2/ax^2+by^2+cz^2

\(Cho\) \(ax+by+cz=0;a+b+c=\dfrac{1}{2018}\) . CMR: \(\dfrac{ax^{2\:}+by^2+cz^2}{bc\left(y-z\right)^2+ac\left(x-z\right)^2+ab\left(x-y\right)^2}=2018\)

cho ax+by+cz=0 va a+b+c=2017 tính \(\dfrac{ax^2+by^2+cz^2}{ac\left(x-z\right)^2+bc\left(y-z\right)^2+ab\left(x-y\right)^2}\)