Aprēķins: IaSCNj - 1

 s^2  = 
 x1^2* p1+ x2^2* p2+ x3^2* p3- x_v^2
 s^2 =  x1^2* p1+ x2^2* p2+ x3^2* p3- x_v^2$$s^{2}$$ = $$x1^{2}\cdot p1+x2^{2}\cdot p2+x3^{2}\cdot p3-x_{v}^{2}$$
 s^2 =  p1* x1^2+ p2* x2^2+ p3* x3^2- x_v^2$$s^{2}$$ = $$p1\cdot x1^{2}+p2\cdot x2^{2}+p3\cdot x3^{2}-x_{v}^{2}$$
s = saknis( p1* x1^2+ p2* x2^2+ p3* x3^2- x_v^2)$$s$$ = $$\sqrt {p1\cdot x1^{2}+p2\cdot x2^{2}+p3\cdot x3^{2}-x_{v}^{2}}$$