第 1 章练习题答案1-2.A= ;B= ;C= ;D= ;E=;T=atan((2*pi*A+E/(2*pi*B*C))/D)1-3clearx=45;(sin(x*pi/180)+sqrt(35))/(72^(1/5))1-4cleara=;b=;exp(a+b)/log10(a+b)1-5clearx=3;y=sqrt(x)-6*(x+1/x)+^2/(x+^31-6clearr=15;d=2*rc=2*pi*rs=pi*r*r1-7cleara=;b=;c=;s=(a+b+c)/2;area=sqrt(s*(s-a)*(s-b)*(s-c))第 2 章练习题答案2-1 clearA=[ 3 1 1;2 1 2;1 2 3];B=[1 1 -1;2 -1 0;1 -1 1];2*A+B,4*(A^2)-3*(B^2),A*B,B*A,A*B-B*A2-2 clearA=[1/3 0 0;0 1/4 0;0 0 1/7];B=inv(inv(A)-eye(3))*62-3 clearB=[1 2 -3 -2;0 1 2 -3;0 0 1 2;0 0 0 1];C=[1 2 0 1;0 1 2 0;0 0 1 2;0 0 0 1];A=(inv(2*eye(4)-inv(C)*B)*inv(C))'2-4 clearA=[2 -1;-1 2];B=[0 -2;-2 0];X=(1/2)*(B+2*A)2-5 clearA=[2 -3 0 2;1 5 2 1;3 -1 1 -1;4 1 2 2];B=[8;2;7;12];X=A\B2-6 A=[3 12 4 7 0 8 1];p=poly2str(A,'x')x=roots(A)2-7 A=[3 12 4 7 0 8 1];B=[1 -3 5 -15 0];[div,rest]=deconv(A,B)第三章=sym('x');limit((cos(sqrt(x)))^(pi/x),x,0,'right') ans =exp(-1/2*pi)=sym('x');f=sym('(3*sin(x)+x^2*cos(1/x))/((1+cos(x))*log(1+x))');limit(f,x,0)ans =3/2=sym('x');f=sym('(sqrt(4*x^2+x-1)+x+1)/sqrt(x^2+sin(x))');limit(f,x,-inf)ans =1 x y;f=sym('(x^2+y^2)^(x^2*y^2)');limit(limit(f,x,0),y,0)ans =1=sym('x');y=sym('(tan(sqrt(x+sqrt(x+sqrt(2*x)))))^2');diff(y,x)ans =tan((x+(x+2^(1/2)*x^(1/2))^(1/2))^(1/2))*(1+tan((x+(x+2^(1/2)*x^(1/2))^(1/2))^(1/2))^2)/(x+(x+2^(1/2)*x^(1/2))^(1/2))^(1/2)*(1+1/2/(x+2^(1/2)*x^(1/2))^(1/2)*(1+1/2*2^(1/2)/x^(1/2))) 3-6.x=sym('x');y=sym('cos(x^2)*sin(1/x)^2');diff(y,x)ans =-2*sin(x^2)*x*sin(1/x)^2-2*cos(x^2)*sin(1/x)*cos(1/x)/x^23-7.x=sym('x');y=sym('sqrt(sin(x)-sin(x)^3)');int(y,x,0,pi) ans =4/3=sym('x');y=sym('sqrt((x+1)/(x-1))/x');int(y,x) ans =-((1+x)/(x-1))^(1/2)*(x-1)*(atan(1/(-1+x^2)^(1/2))-log(x+(-1+x^2)^(1/2)))/((1+x)*(x-1))^(1/2)('D2y+4*Dy+4*y=exp(-2*x)','x') ans = 1/2*exp(-2*x)*(2*C2+2*x*C1+x^2)3-10.dsolve('x^2*Dy+x*y=y^2','y(1)=1') ans =x*exp(1/x)/(exp(1/x)+exp(1/x*t)*x-exp(1/x*t))第四章4-1.plot([1 2 4 0 5 10 11 21 3 1]...
