MATLAB 题目解答一下，。、

四：

z1 = 2*sind(85)/(1+exp(1)^2);
x = [2,1+2*1i; -4.5, 5];
z2 = 1/2*log(x+sqrt(1+x.^2));
a = -3:0.1:3;
z3 = (exp(0.3*a)-exp(-0.3*a))/2.*sin(a+0.3)+log((a+0.3)/2);
z4 = [(0:0.05:0.95).^2, (1:0.05:1.95).^2-1, (2:0.05:2.5).^2-2*(2:0.05:2.5)+1];
save mydata.mat % 保存全部变量

2题

A = [12,34,-4; 34,7,87;3,65,7];
B = [1,3,-1; 2,0,3;3,-2,7];
% (1)
A+6*B
A-B+eye(size(A))
% (2)
A*B
A.*B
% (3)
A^3
A.^3
% (4)
A/B
B\A
% (5)
[A,B]
[A([1,3],:); B^2]

第2题答案

ans =

      18             52            -10       
      46              7            105       
      21             53             49       


ans =

      12             31             -3       
      32              8             84       
       0             67              1       


ans =

      68             44             62       
     309            -72            596       
     154             -5            241       


ans =

      12            102              4       
      68              0            261       
       9           -130             49       


ans =

   37226         233824          48604       
  247370         149188         600766       
   78688         454142         118820       


ans =

    1728          39304            -64       
   39304            343         658503       
      27         274625            343       


ans =

      82/5          -68/5           38/5     
     179/5         -381/5          251/5     
      67           -134             68       


ans =

     547/5         -656/5         1614/5     
     -53             85           -171       
    -308/5          449/5         -931/5     


ans =

      12             34             -4              1              3             -1       
      34              7             87              2              0              3       
       3             65              7              3             -2              7       


ans =

      12             34             -4       
       3             65              7       
       4              5              1       
      11              0             19       
      20             -5             40