Байарыст 2018-1 №4 вариант 4

Bayarystanov A.O. 2018-1 work №4 option 4
Pyramids of the table A(2;5;1); B(–3;–2;9); C( 3 ;–5;6 ); D(4;–9;–7) berilgen. Taboo kerek: a)|AB|; b) BC; BD; c) S ABC ; d) V ABCD.

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