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1、1A=[1,2,3,4,5,6,7,7.8;9,9,9,9,0,0,0,-2;4,4,4,4,4,7,7,89;8,8,7,54,3,8,0,12;9,9,9,9,0,0,0,-2;8,8,7,54,3,8,0,12]1)B=A(2:5,1:2:5)B=9904448739902)C=AC(3,:)=[]3)D=AD(find(D==0))=0.1D=12345677.899990.10.10.1-244444778988754380.11299990.10.10.1-288754380.1124)E=max(A)E=9995458
2、7895)F=sort(A,1,'descend')9995458789999544871288793701288793607.84444000-21234000-22A=[15,6,7,7.8;0,0,0,-2;44,7,7,89;3,8,0,12]1)B=rand(size(A))B=0.950130.89130.821410.921810.231140.76210.44470.738210.606840.456470.615430.176270.485980.0185040.791940.405712)C=A.*BC=14.2
3、525.34785.74997.1901000-1.476426.7013.19534.30815.6881.45790.1480304.86853)D=A(find(A>0&A<10))D=3678777.84)E=min(A,[],2)E=6-2705)F=mean(A)F=15.55.253.526.73x=-7.6;y=8.2;y=tan((abs(x)+abs(y))/abs(x+y))*exp(cos(x))y=3.31274x=sqrt(1+pi);y=(exp(x)+log(sin(x)^2-sin(x^2)))/(
4、x-5*i)y=0.56903+1.398i5a=[423;110;-123];c=a-5;b=a*inv(c)b=0.57143-0.71429-0.28571-0.428570.28571-0.28571-0.42857-0.714290.714296A=[1,-1,-1;2,-1,-3;3,2,-5];B=[2;1;0];X=inv(A)*BX=5-4.4409e-01637f=sym('(sqrt(5*x-4)-sqrt(x))/(x-1)');limit(f,sym('x'),1)ans=28symsxyy=sqrt(x*
5、sin(x)*sqrt(1-exp(x)))diff(y)y=(x*sin(x)*(1-exp(x))^(1/2))^(1/2)ans=1/2/(x*sin(x)*(1-exp(x))^(1/2))^(1/2)*(sin(x)*(1-exp(x))^(1/2)+x*cos(x)*(1-exp(x))^(1/2)-1/2*x*sin(x)/(1-exp(x))^(1/2)*exp(x))9f=sym('1/((arcsin(x)^2)*sqrt(1-x*x))');f1=int(f)f1=-1/asin(x)10symsxyz[x,y
6、,z]=solve(x*x-y*y+z,x+y-z,3*x-y-z-2)x=1/2y=-1/2z=011functionfx=fun(x)fx=x*x+2*x-exp(x)+5;z=fzero(@fun,200)z=2.992912x=input('输入一个x的值：');ifx<0y=log(x*x+1)+sqrt(x*x+1);elsey=sin(x)/(x+1);end;display([y]);输入一个x的值：1.5ans=0.399输入一个x的值：-1.5ans=2.981413x=input('请输入成绩:')ifx>=9
7、0y='成绩等级为A'elseifx<90&x>=80y='成绩等级为B'elseifx<80&x>=70y='成绩等级为C'elseifx<70&x>=60y='成绩等级为D'elsex<60y='成绩等级为E'end请输入成绩:79x=79y=成绩等级为C14x=-3:0.1:3;y=x-(x.^3)/6;plot(x,y,'r');title('xfrom-3to3');xlabel('VariableX');ylabel('VariableY');text(2,1,'曲线y=x-x^3/3!');15x=linspace(1
8、,10,101);y=log(x);f=polyfit(x,y,5);yy=polyval(f,x);plot(x,y,'m',x,yy,'y')16N=128;T=1;t=linspace(0,T,N);x=3*cos(20*t+p
