展开 ((-1-t),(12-11+2t^2))*(-2,-1)

解答

展开

((- 1 - t), (12 - 11 + 2 t^{2})) \cdot (- 2, - 1)

- 2 (, (- 1 - t) (12 - 11 + 2 t^{2})), - 1 \cdot (, (- 1 - t) (12 - 11 + 2 t^{2}))

求解步骤

((- 1 - t), (12 - 11 + 2 t^{2})) (- 2, - 1)

= (- 2, - 1) (, (- 1 - t) (12 - 11 + 2 t^{2}))

使用分配律:

a (b - c) = ab - a c

a = ((- 1 - t), (12 - 11 + 2 t^{2})), b = - 2,, c = 1

= ((- 1 - t), (12 - 11 + 2 t^{2})) (- 2,) - ((- 1 - t), (12 - 11 + 2 t^{2})) \cdot 1

使用加减运算法则

+ (- a) = - a

= - 2 (, (- 1 - t) (12 - 11 + 2 t^{2})), - 1 \cdot (, (- 1 - t) (12 - 11 + 2 t^{2}))

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