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W = 26/[1+30e^(-2t/3)]
(1) W(0) = 26/(1+30) = 26/31 ≈ 0.84g
(2) dW/dt = -26 [1+30e^(-2t/3)]^(-2) 30e^(-2t/3) (-2/3)
= 520e^(-2t/3)/[1+30e^(-2t/3)]^2
(3) lim<t→+∞>W = lim<t→+∞>26/[1+30e^(-2t/3)] = 26 g
体重始终小于 26g, 但趋近于 26g
(1) W(0) = 26/(1+30) = 26/31 ≈ 0.84g
(2) dW/dt = -26 [1+30e^(-2t/3)]^(-2) 30e^(-2t/3) (-2/3)
= 520e^(-2t/3)/[1+30e^(-2t/3)]^2
(3) lim<t→+∞>W = lim<t→+∞>26/[1+30e^(-2t/3)] = 26 g
体重始终小于 26g, 但趋近于 26g
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