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1) + = + - .
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3) + =
4) +(-1) =
5) (a×b) = a(b )
6) (a+b) = a + b -
7) a( + ) = a + a
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(x1, y1, z1), B(x2, y2, z2), = (x2 x1, y2 y1, z2 z1).
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(1; 2; 3), (-1; 0; 3), (2; 1; -1) (3; 2; 2) . , , .
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D1 =
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D2 =
D3 =
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(, , z) l/m, , :
:
x = (x1 + x2)/2; y = (y1 + y2)/2; z = (z1 + z2)/2.
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