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,
­ , (. 3.1).
5 (2011-2015)
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2. " ", " ", " "
a = (1; 2; 3), b = (61; 62; 63), c = (c1; C2; C3), d = d2; d3) . , a, b, c ­ d . a = (-2; 4; 1), b = (1; 7; -8), c = (-3; -2; 5), d = (-4
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