展开 B(3,6,-9)A(-4,8,-5)

解答

展开

B (3, 6, - 9) A (- 4, 8, - 5)

- 3 B A, 6, 4, 8, - 3 B A, 6, 5 + 9 \cdot 4 B A, 8, 9 \cdot 5

求解步骤

B (3, 6, - 9) A (- 4, 8, - 5)

= (3 \cdot 6,, - 9) (- 4 \cdot 8,, - 5) B A

乘开

(3, 6, - 9) (- 4, 8, - 5) : - 3, 6, 4, 8, - 3, 6, 5 + 9 \cdot 4, 8, 9 \cdot 5

= B A (- 3, 6, 4, 8, - 3, 6, 5 + 9 \cdot 4, 8, 9 \cdot 5)

乘开

B A (- 3, 6, 4, 8, - 3, 6, 5 + 9 \cdot 4, 8, 9 \cdot 5) : - 3 B A, 6, 4, 8, - 3 B A, 6, 5 + 9 \cdot 4 B A, 8, 9 \cdot 5

= - 3 B A, 6, 4, 8, - 3 B A, 6, 5 + 9 \cdot 4 B A, 8, 9 \cdot 5

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