展开 (6/5 pi,-3.7)(pi,-11)

解答

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(\frac{6}{5} π, - 3.7) (π, - 11)

π \frac{6}{5}, π, - π \frac{6}{5}, 11 - 3.7 π, 11 \cdot 3.7

求解步骤

(\frac{6}{5} π, - 3.7) (π, - 11)

= (π \frac{6}{5}, - 3.7) (π, - 11)

使用 FOIL 方法:

(a + b) (c + d) = a c + a d + b c + b d

a = \frac{6}{5} π,, b = - 3.7, c = π,, d = - 11

= \frac{6}{5} π, π, \frac{6}{5} π, (- 11) + (- 3.7) π, (- 3.7) (- 11)

使用加减运算法则

+ (- a) = - a, (- a) (- b) = ab

= π \frac{6}{5}, π, - π \frac{6}{5}, 11 - 3.7 π, 11 \cdot 3.7

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