Байарыст 2018-1 №4 вариант 20

Bayarystanov A.O. 2018-1 work №4 option 20
Pyramidany tөbeleri A(7;–1;–2); B(1;–7;8); C( 3 ;–8;9 ); D(–2;–5;2) berilgen. Taboo kerek: a)|AB|; b) BC; BD; c) S ABC ; d) V ABCD.

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