Post

@MathMath901 A little lesson in elegance...
a + b = -c
b + c = -a
a + c = -b
((-c)² + (-a)² + (-b)²) / (a² + b² + c²)
(c² + a² + b²) / (a² + b² + c²) = 1
In a zero sum system, any two variables imply a third. C.S. Peirce would call this iconic or abductive reasoning. Very useful.
English


@MathMath901 Numerator=(2a^2+2b^2+2c^2+2ab+2bc+2ac)=
(2a^2+2b^2+2c^2+2a(b+c)+2bc)=
(2a^2+2b^2+2c^2-2a^2+2bc)=
(2b^2+2c^2+2bc)=
(2b^2+2c^2+2bc)=
(b^2+c^2+(b+c)^2)=
a^2+b^2+c^2
So, the quotien is 1
English

@MathMath901 put a=0 b=1 and c=-1
Numerator = 2
Denominator = 2
Answer = 2/2 =1
Română

@MathMath901 a + b = - c => (a+b)^2 = c^2 (1)
b + c = -a => (b+c)^2 = a^2 (2)
a + c = -b => (a+c)^2 = b^2 (3)
(1) + (2) + (3) => (a+b)^2 + (b+c))^2 + (a+c)^2 =
= a^2 + b^2 + c^2 =>
[(a+b)^2 + (b+c))^2 + (a+c)^2] / (a^2 + b^2 + c^2) = 1
Tiếng Việt
@MathMath901 (a+b)² = (-c)², (b+c)² = (-a)², (a+c)² = (-b)² ---> quotient=1
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