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cho a+b+c=0 cmr a^4+b^4+c^4=2(ab+bc+ac)^2
cho a+b+c=0 cmr a^4+b^4+c^4=2(ab+bc+ac)^2
Cho a+b+c=0
CMR : a^4 + b^4 + c^4 = 2 ( ab + ac + bc )^2
a/ cho x2+y2+z2= xy+yz+xz. cmr x=y=z
b/ cho (a-b)2+(b-c)2*(c-a)2+4(ab+ac+bc)=4 (a2+b2+c2). cmr a=b=c
a) Cho \(x^2+y^2+z^2=xy+yz+zx\). CMR : x=y=z
b) cho \(\left(a-b\right)^2+\left(b-c\right)^2+\left(c-a\right)^2+4\left(ab+ac+bc\right)=4\left(a^2+b^2+c^2\right)\). CMR : a=b=c
a,cho (a+b+c)^2 =3(ab+ac+bc)
cmr:a=b=c
b,Cho(a-b)^2+(b-c)^2+(c-a)^2 +4(ab+bc+ca)=4(a^2+b^2+c^2)
cmr:a=b=c
Cho a+b+c=0
CMR: (a+b+c)4=2(ab+bc+ac)2
cho a+b+c=0 . CMR a, ( ab+bc+ca)^2 = a^2b^2+b^2c^2+c^2a^2 b, a^4+b^4+c^4=2(ab+bc+ca)^2
Cho ( a – b)2 + ( b – c )2 + ( c – a )2 = 4 ( a2 + b2 + c2 – ab – ac – bc ).
CMR : a = b = c .