1.计算（1）1/2st+3st-6ts-2 (2)8a-a的立方+a的平方+4a的立方-a的平方-7a (3)7xy+xy的立方+4+6x-2/5xy的立方-5xy-3

1.计算（1）1/2st+3st-6ts-2 (2)8a-a的立方+a的平方+4a的立方-a的平方-7a (3)7xy+xy的立方+4+6x-2/5xy的立方-5xy-3 1st boot device下的各种选项是什么意思,装完机后怎么改回来2st boot device 3st boot device 4st boot device怎么改 3*st*（s^-3+t^-3）^1/2 matlab绘图无错误提示 却显示空白图>> st=linspace(0,0.01,1);>> lam=1;>> w=((2*(3*lam-(2-st)*(1-st))^2+(3*lam-2*(2-st)*(1-st))^2)+lam*(9*lam-2*(2-st)^2))/(9*lam-2*(2-st)^2)^2;>> plot(st,w,'r') 数列0,1,1,2,2,3,3,4,...,r,r,r+1,r+1,...令Tn表示数列前n项的和.证明：Ts+t-Ts-t=st s,t为正整数,s>t. DISTANCE 1st是什么意思? CAPO:1st 1st of 1st runner up St. ST. 英语翻译SHAFT,1ST & REVERSE SHIFT LEVER,1ST & REVERSE SHIFT RAIL,1ST & REVERSE SHIFT JAW,1ST & REVERSE SHIFT JAW,1ST & REVERSE SHIFT RAIL RAIL,1ST & REVERSE SHIFT FORK.1ST & REVERSE GEARSHIFT 2ND & 3RD SHIFT RAIL ASSY FORK,2ND & 3RD GEARSHIFT JAW shape st[][]=new shape[3][2]; shape st[0][0]=new circle(2); shape st[0][1]=new circle(4);为什么不对? 1st 2nd 3rd怎么读? 1st & 3rd washes No undesirable Children’sDay is on（）1st Fools’sDay is on（）1st 1st Draft 2nd draft...