3t+t-2t=?

3t+t-2t=? 已知f(t)=3t*t-2t-2/t+3/t*t,证明f(t)=f(1/t) x=2t-t*t y=3t-t*3的拐点是什么? 4t^-8t+5-3t^+6t-2 其中t=2/1 已知t-(2)/t=3,求4t/(t的平方-7t-2) 3t^2+3t-1-t^3=0, 为什么(t^3)'=3t^2t' 79.788456t - 1250t^2 - 8311.297508t^3 = 1 t（t-2）-3t=0 解方程t（t-2）-3t =0 5t平方-2t+3=0求t t^2+3t=400求t 当t=1时,代数式t^3-2t[2t^2-3t(2t+2)]的值 3t+3=8-2t 3t^2-1=6t (t+3t^2-3)-(-t+4t^2) 化简 （t+3t^2-3)-(-t+4t^2) 化简 (2t+3)(2t-)-(4t+1)(t-9)