79.788456t - 1250t^2 - 8311.297508t^3 = 1

79.788456t - 1250t^2 - 8311.297508t^3 = 1 T T “T “T T 3t+t-2t=? t*exp(2t)对t求导 t/(t^2-t+1)的积分 T^T英语第2T (t+3t^2-3)-(-t+4t^2) 化简 （t+3t^2-3)-(-t+4t^2) 化简 计算 (t+2)(t²-t+1)+t-2 (2t+3)(2t-)-(4t+1)(t-9) t^2-t+2求导 因式分解：t^2-t-2 叶形线：x=2*t-t*t,y=2*t*t-t*t*t 图形怎么划? 微分方程 矩阵 x'(t)=x(t)+y(t)+2t y'(t)=x(t)+y(t)-2t