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1、第1章练习题答案1-2.A二1.2;B=-4.6;C=8・0;D=3.5;E二-4.0;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=5.67;b=7.811;exp(a+b)/loglO(a+b)1-5clearx=3;y=sqrt(x)-6*(x+l/x)+(x-3.2厂2/(x+7.7厂31-6clearr二15;d二2*rc二2*pi*rs二pi*》、*》、1-7clear3二&5;b=14.6;c=l&4;s=(a+b+c)/2;area=sqrt
2、(s*(s~a)*(s~b)*(s~c))第2章练习题答案2-1clearA二[311;212;123];B=[l1-1;2-10;l-11];2*A+E,4*(A"2)-3*(L2),A*B,B*A,A*B-B*A2-2clearA二[1/300;01/40;001/7];B=inv(inv(A)-eye(3))*62-3clearB=[l2-3-2;012-3;0012;0001];C二[120l;0120;0012;0001];A二(inv(2*eye(4)-inv(C)*B)*inv(C))'1-4clearA二[2-1;-12];B=[0-2;-20];X=(l/2)*(B+2
3、*A)1-5clearA二[2-302;1521;3-11-1;4122];B二[8;2;7;12];X=AB1-6A=[31247081];p=poly2str(A,'x)x二roots(A)2-7A二[31247081];B=[l-35-150];[div,rest]二deconv(A,B)第三章3-1.x二sym('x');1imit((cos(sqrt(x)))八(pi/x),x,0,'right')ans二exp(T/2*pi)2-2・x=sym(，x，);f=sym(,(3*sin(x)+x~2*cos(l/x))/((l+cos(x))*log(l+x))');limit
4、(f,x,0)ans=3/22-3・x=sym(，x');f=sym(，(sqrt(4*x2+x~l)+x+l)/sqrt(x2+sin(x))*);limit(f,x,-inf)ans=12-4・symsxy;f=symC(xJ+yJ),xJ*yJ)');limit(limit(f,x,0),y,0)ans二13~5.x二sym('x');y=sym('(tan(sqrt(x+sqrt(x+sqrt(2*x))))厂2');diff(y,x)ans=tan((x+(x+2八(1/2)*x"(1/2)厂(1/2)厂(1/2))*(1+tan((x+(x+2八(1/2)*x"(1/2)厂(
5、1/2)厂(1/2)厂2)/(x+(x+2八(l/2)*x"(l/2)厂(1/2)厂(l/2)*(l+l/2/(x+2气1/2)*x"(1/2)厂(1/2)*(1+1/2*2八(1/2)/x*(1/2)))1-6・x=sym(，x');y=sym(,cos(x~2)*sin(1/x厂2');diff(y,x)ans=-2*sin(x2)*x*sin(l/x)2-2*cos(x2)*sin(1/x)*cos(l/x)/x21-7.x=sym(，x');y二sym('sqrt(sin(x)-sin(x)3)');int(y,x,0,pi)ans=4/33~8.x=sym(，x');y二sym
6、('sqrt((x+1)/(x-1))/x');int(y,x)ems=-((l+x)/(x-1))(1/2)*(xT)*(atan(l/(~l+x2)(1/2))-log(x+(-l+x2)(1/2)))/((l+x)*(x—l)厂(1/2)1-9・dsolve('D2y+4*Dy+4*y=exp(-2*x)','x')ans二l/2*cxp(-2*x)*(2*C2+2*x*Cl+x"2)3-10.dsolve(，x，'2Wy+x*y=y，'2,,'y(l)=l')ans二x*exp仃/x)/(exp(1/x)+exp(l/x*t)*x~exp(l/x*t))第四章4-1.plot([
7、l240510112131])2-2.t二0:pi/100:2*pi;x=cos(t);y=sin(t);plot(x,y);axis(，square');2-3.R=[l51020];1=0:0.1:10;U=I'*R;plot(I,U);1-4.mon=l:12;temp=[0.22.38.718.524.632.136.837.128.317.86.4-3.2];rainf=[4.63.62.12.93.02.72.22.54
