·几何意义 y(t) dy y0e是 y(0) d |tt y(t) 0-yt) tga= t-ti 次切距 =-y0)e7 t-ti t=t-ti • ࠐօ᜿ѹ W = t 2– t 1 dy dt t=t 1 y(0 + )e – IJt1 ± IJ = tg D = t 2–t 1 0 –y(t 1 ) = y(0 + )e – IJt1 – t 2–t 1 y(t 1 ) t 1 t 2 y(0 + ) y(t) 0 t 䐍࠷1/9 D