展开 ((-40)/5 big)^2(5-40)2

解答

展开

(\frac{- 40}{5} bi g)^{2} (5 - 40) 2

2 \cdot 5 (i \frac{- 40}{5} b g)^{2} - 2 \cdot 40 (i \frac{- 40}{5} b g)^{2}

求解步骤

(\frac{- 40}{5} bi g)^{2} (5 - 40) \cdot 2

= 2 (5 - 40) (i \frac{- 40}{5} b g)^{2}

使用分配律:

a (b - c) = ab - a c

a = (\frac{- 40}{5} bi g)^{2} \cdot 2, b = 5, c = 40

= (\frac{- 40}{5} bi g)^{2} \cdot 2 \cdot 5 - (\frac{- 40}{5} bi g)^{2} \cdot 2 \cdot 40

= 2 \cdot 5 (i \frac{- 40}{5} b g)^{2} - 2 \cdot 40 (i \frac{- 40}{5} b g)^{2}

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e x p an d (1 + c e^{- x})^{2}

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