3/2（t-1)=1-3/1(t-1)用整体思想解方程

(2t+3)(2t-)-(4t+1)(t-9) 已知f(t)=3t*t-2t-2/t+3/t*t,证明f(t)=f(1/t) 4t^-8t+5-3t^+6t-2 其中t=2/1 化简t+1/t-(t+2)²-1/t²×t+1/t+3 (t^5+t^4+t^3+t^2+t+1)(t-1) 用直式计算 3t^2+3t-1-t^3=0, 79.788456t - 1250t^2 - 8311.297508t^3 = 1 当t=1时,代数式t^3-2t[2t^2-3t(2t+2)]的值 3t^2-1=6t 画出下列信号的波形1）f(t)=tu(t); 2)f(t)=t[u(t)-u(t-2)]; 3)f(t)=(t-1)u(t-1); 4)f(t)=sint/t画出图形~ 用解析法求下列二阶微分方程(1) y(t) + 4y(t) + 3y(t) = f (t),f (t) = ε (t)(2) y(t) + 4y(t) + 4y(t) = f '(t) + 3 f (t),f (t) = e−tε (t)注：e-t为e的-t次方其中ε (t)为阶跃函数,即当t0时,ε (t)=1 5t-3≤4t-1 7+2t>6+3t 3+t 5t-3≤4t-1 7+2t>6+3t 3+t (1-t)^3=1-3t+3t^2-t^3?如何化简得 解分式方程:t-1分之t=1+(t-1)(t+2)分之3 求(1+t)*(27t+3)/((1+3t)^2)的最大值 t〉=0 3t^2-1=(a^3-a-t^3+t)/(a-t) f(t)=t²+3t-1 t=-3/2