Расчет: Qgz9IM - 1
DX =
( x1^2* p1+ x2^2* p2+ x3^2* p3)- (EX)^2
( x1^2* p1+ x2^2* p2+ x3^2* p3)- (EX)^2
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DX = ( x1^2* p1+ x2^2* p2+ x3^2* p3)- (EX)^2$$DX$$ = $$(x1^{2}\cdot p1+x2^{2}\cdot p2+x3^{2}\cdot p3)-(EX)^{2}$$
DX = p1* x1^2+ p2* x2^2+ p3* x3^2- EX^2$$DX$$ = $$p1\cdot x1^{2}+p2\cdot x2^{2}+p3\cdot x3^{2}-EX^{2}$$