Respuesta:
a²+b²+c².
Explicación paso a paso:
Sea
[tex] x = \frac{a + b + c}{2} .[/tex]
Entonces
(x-a)²=(1/4)(a²+b²+c²-2ab-2ac+2bc)
(x-b)²=(1/4)(a²+b²+c²-2ab+2ac-2bc))
(x-c)²=(1/4)(a²+b²+c²+2ab-2ac-2bc)
x²=(1/4)(a²+b²+c²+2ab+2ac+2bc)
Luego:
x²+(x-a)²+(x-b)²+(x-c)²=(1/4)[4(a²+b²+c²)+(2ab+2ac+2bc)-(2ab+2ac+2bc)]=a²+b²+c².
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Respuesta:
a²+b²+c².
Explicación paso a paso:
Sea
[tex] x = \frac{a + b + c}{2} .[/tex]
Entonces
(x-a)²=(1/4)(a²+b²+c²-2ab-2ac+2bc)
(x-b)²=(1/4)(a²+b²+c²-2ab+2ac-2bc))
(x-c)²=(1/4)(a²+b²+c²+2ab-2ac-2bc)
x²=(1/4)(a²+b²+c²+2ab+2ac+2bc)
Luego:
x²+(x-a)²+(x-b)²+(x-c)²=(1/4)[4(a²+b²+c²)+(2ab+2ac+2bc)-(2ab+2ac+2bc)]=a²+b²+c².