Расчет: fhgzYQ - 1

A* B =
x1* x2+ y1* y2

A* B = x1* x2+ y1* y2 $A\cdot B$ = $x1\cdot x2+y1\cdot y2$

A =

( x1* x2+ y1* y2)

/ B

$A$ = $\frac{x1\cdot x2+y1\cdot y2}{B}$

A =

x1* x2

/ B

+

y1* y2

/ B

$A$ = $\frac{x1\cdot x2}{B}+\frac{y1\cdot y2}{B}$