1/2(t-4)(4t-16)+1/2[（4t-16)+(t-1)]×3-1/2(t-1)(t-1)=(麻烦用笔写下来,要完整的过程,谢谢!）

(2t+3)(2t-)-(4t+1)(t-9) (t^5+t^4+t^3+t^2+t+1)(t-1) 用直式计算 4t^-8t+5-3t^+6t-2 其中t=2/1 5t-3≤4t-1 7+2t>6+3t 3+t 5t-3≤4t-1 7+2t>6+3t 3+t 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~ (t-1)^2+4(t-1)+1怎么化简成t^2+2t-2 1-4t+t^2（因式分解）1-4t+t² -2t的平方+4t+4/t的平方-2t-1 3t/4t-6,t+1/4t^2-9 4t^3-3t^2-2t+1=0 t等于多少 -t²+t+1为什么等于-(t-t/2)²+5/4 t小于0,求y=(t^2-4t+1)/t的最大值 t>0,y=(t^2-4t+1)/t最小值 t>0,y=(t^2-4t+1)/t的最小值是 已知t>0,则函数y=(t^2-4t+1)/t的最小值为 [T,Y]=ode45(@rigid,[0 1],[rand(15,1)]);plot(T,Y(:,1),'-',T,Y(:,2),'-.',T,Y(:,3),'.',T,Y(:,4),'-',T,Y(:,5),'-.',T,Y(:,6),'.',T,Y(:,7),'-',T,Y(:,8),'-.',T,Y(:,9),'.',T,Y(:,10),'-',T,Y(:,11),'-.',T,Y(:,12),'-.',T,Y(:,13),'.',T,Y(:,14),'-',T,Y(:,15),'.') matlab中怎么对下面的程序进行二维插值并画出三维视图呢?[x,y]=meshgrid(-2:1:2);t=2;Z=[(sin(t))^3 t^2 sin(t) cos(t) (sin(t))^2;t^2 sin(t) (cos(t))^4 cos(t) (sin(t))^2;t sin(t) cos(t) t^2 (sin(t))^2;sin(t) (cos(t))^3 t^2 (sin(t))^2