数学实验答案

实验一

%sy1ljq20111668

%第一大题

%1

x=[3,2*pi];

y1=sin(x)+exp(x)

%y1= 20.2267 535.4917

%2

x=2:2:10

y2=x.^2+sqrt(2*x)

%y2= 6.0000 18.8284 39.4641 68.0000 104.4721 %3

a=2*pi,b=35/180*pi,c=exp(2);

y31=sin(a/5)+cos(b)*c

y32=tan(b)*cot(a/3)

%y31 =7.0038

%y32 =-0.4043

%6

a1=-6.28,a2=7.46,a3=5.37;

a11=fix(a1)

a21=fix(a2)

a31=fix(a3)

%a11=-6

%a21=7

%a31=5

%7

y71=abs(a1*a2+a3)

y72=a1^2*sqrt(a2*a3/2) %y71 =41.4788

%y72 =176.5066

%8

save sy1

clear

%9

load sy1

%10

A=[2 -5 6;8 3 1;-4 6 9]; A1=A'

A2=det(A)

A3=5*A

save sy1 A1 A2 A3

%A1 = 2 8 -4

-5 3 6

6 1 9

%A2 =782

%A3 = 10 -25 30

40 15 5

-20 30 45

%第二大题

%1

X=0:pi/10:2*pi;

Y=cos(X);S=[X',Y']

%S =

0 1.0000

0.3142 0.9511 0.6283 0.8090

0.9425 0.5878

1.2566 0.3090 1.5708 0.0000

1.8850 -0.3090

2.1991 -0.5878 2.5133 -0.8090

2.8274 -0.9511

3.1416 -1.0000 3.4558 -0.9511

3.7699 -0.8090

4.0841 -0.5878 4.3982 -0.3090

4.7124 -0.0000

5.0265 0.3090 5.3407 0.5878 5.6549 0.8090

5.9690 0.9511

6.2832 1.0000

%2

a22=input('a22='); b22=input('b22=');

c22=input('c22=');

s=(a22+b22+c22)/2;

A2=sqrt(s*(s-a22)*(s-b22)*(s-c22))

%A2=19.5225

%3

sumjs=0;sumos=0;

for i=1:2:99

sumjs=sumjs+i;

sumos=sumos+i+1;

end

sumjs

sumos

%sumjs =2500

%sumos =2550

%4

i=0;

while i<=1000

i=i+1;

if(rem(i,3)==2&rem(i,5)==3&rem(i,7)==2)

i

end

end

%i=23,128,233,338,443,548,653,758,863,968, %第三大题

x=[3 -4 8];

y=(x.^2+5*x).*exp(2-x)

%y= 1.0e+003 *

% 0.0088 -1.6137 0.0003

实验二

%sy2ljq20111668

%第一大题

%1.1

x1=[3,5,-1,2,8,12];

y1=3*x1.^2+exp(x1)-x1+2

%y1 =1.0e+005 *

% 0.0005 0.0022 0.0001 0.0002 0.0317 1.6318 %1.2

x2=[-2,-1,0,1,2,3,4];

y2=(sin(x2+2)-1)/(x2.^3+6)

%y2 =-0.0292

%第二大题

%2.1

x=input('x=');

if x<0

y11=exp(x)+x.^3;

else

y11=2*x-sin(4*x);

end

x,y11

%x =6.2832,y11 =12.5664

%x =-12,y11 =-1.7280e+003

%2.2

x=input('x=')

if x>0

y2=5*x+3;

elseif x<0

y2=3*x.^2;

else y2=4;

end

x,y2

%x=45,y2=228

%x=-32,y2=3072 %第三大题

x=input('x=');

if x>0

y3=log(2*x); else

y3=2*x.^3-x+5; end

x,y3

%x =4,y3 =2.0794 %x=0,y3=5

%x=-2,y3=-9

%第四大题

%4.1

for i=1:6

for j=1:6

if i==j