3(2-3t)-4(3t-1)

(2t+3)(2t-)-(4t+1)(t-9) (t^5+t^4+t^3+t^2+t+1)(t-1) 用直式计算 5t-3≤4t-1 7+2t>6+3t 3+t 5t-3≤4t-1 7+2t>6+3t 3+t 4t^-8t+5-3t^+6t-2 其中t=2/1 (t+3t^2-3)-(-t+4t^2) 化简 （t+3t^2-3)-(-t+4t^2) 化简 化简t+1/t-(t+2)²-1/t²×t+1/t+3 参考身高: 2T 3T 4T 5T 6T 8T是什么意思 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~ 4t^3-3t^2-2t+1=0 t等于多少 3t/4t-6,t+1/4t^2-9 [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),'.') 已知f(t)=3t*t-2t-2/t+3/t*t,证明f(t)=f(1/t) 已知t-(2)/t=3,求4t/(t的平方-7t-2) 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 3t+t-2t=? 求4*4 matrix的determinant| -t ,0,0,-24|-t,0,0| 1,-t,0,50 |1,-t,0| 0,1,-t,-35| 0,1,-t| 0,0,1,10-t| 0,0,1用编织发做,算出来等于(-t)(-t)(-t)(10-t)-24但是正确答案是t^4-10t^3+35t^2-50t+24