solvefor d,d(t)=1399(0.95)^t

解答

求解

d, d (t) = 1399 (0.95)^{t}

d = \frac{1399 \cdot 0.9 5 ^{t}}{t}; t \neq = 0

求解步骤

d (t) = 1399 (0.95)^{t}

d t = 1399 \cdot 0.9 5^{t}

两边除以

t; t \neq = 0

d = \frac{1399 \cdot 0.9 5 ^{t}}{t}; t \neq = 0

y^{^{''}} + (\frac{1}{r}) y^{^{'}} = b

y^{^{''}} - 10 y^{^{'}} + 61 = 0

\frac{d ^{2} x}{d t ^{2}} + 9 \frac{d x}{d t} + 8 x = 2 t

y^{^{''}} - 7 y^{^{'}} + 14 y = - 2 e^{3 t}, y (0) = - 6

y^{^{''}} - 5 y^{^{'}} + 6 y = x e^{3 x}