展开 t(0=2e^{-50t}-70te^{-50t})

解答

展开

t (0 = 2 e^{- 50 t} - 70 t e^{- 50 t})

0 = 2 e^{- 50 t} - 70 e^{- 50 t} t^{2}

求解步骤

t (0 = 2 e^{- 50 t} - 70 t e^{- 50 t})

= t (0 \cdot 2 = e^{- 50 t} - 70 e^{- 50 t} t)

使用分配律:

a (b - c) = ab - a c

a = t, b = 0 = 2 e^{- 50 t}, c = 70 t e^{- 50 t}

t \cdot 0 = 2 e^{- 50 t} - t \cdot 70 t e^{- 50 t}

0 \cdot t = 2 e^{- 50 t} - 70 e^{- 50 t} tt

化简

0 \cdot t = 2 e^{- 50 t} - 70 e^{- 50 t} tt : 0 = 2 e^{- 50 t} - 70 e^{- 50 t} t^{2}

0 = 2 e^{- 50 t} - 70 e^{- 50 t} t^{2}

e x p an d \frac{2 ( 1 + x )}{x ( 2 + x )}

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