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2x=input(输入;);if x=90&x=80&x=70&x=60&x=90&x=80&x=70&x=60&x=69 grade=D;elseif x=0 grade=E;else grade=F;endgrade1x=input(输入x=;);if x=0&x120 money=(y-120)*84*115100+120*84;elseif y=60 money=y*84;else money=84*y-700;endmoney4. a=fix(rand*100)b=fix(rand*100)t=input( ;)switch t case+ d=a+b; case- d=a-b; case* d=a*b; case/ d=a/b;endd5. a=fix(rand(5,6)*89)+10;n=input(输入：);if n5|n0 b=a(5,:); disp( bvhk,num2str(b) else c=a(n:n,:) end实验41（1）sum=0;n=100;for i=1:nsum=sum+1/i/i;endpi=sqrt(6*sum);endpipi = 3.1321（2）sum=0;n=1000;for i=1:nsum=sum+1/i/i;endpi=sqrt(6*sum);endpipi = 3.1406（3）sum=0;n=10000;for i=1:nsum=sum+1/i/i;endpi=sqrt(6*sum);endpipi =3.14152n=1;y=0;while (y10-5) g=a/(b+x); x=a/(b+g); n=n+1; if n499 break endend disp(迭代结果是：,num2str(x) disp(循环次数是,num2str(n),次)r1=(-b+sqrt(b2+4*a)/2;r2=(-b-sqrt(b2+4*a)/2;disp(如果迭代收敛，准确值是：,num2str(r1), 或者是：,num2str(r2). f请输入x的初始值：1.0请输入常数a的值：4请输入常数b的值：5迭代结果是：0.70156循环次数是3次如果迭代收敛，准确值是：0.70156 或者是：-5.7016 4.5.m=input(m=);p=1:m;p(1)=0;for i=2:sqrt(m) for j=2*i:i:m p(j)=0; endendn=find(p=0);p(n)m=50ans = Columns 1 through 6 2 3 5 7 11 13 Columns 7 through 12 17 19 23 29 31 37 Columns 13 through 15 41 43 475.实验五3function z=fun(x)p=x;for i=2:sqrt(99) n=find(rem(p,i)=0&p=i); p(n)=;endpn=length(p)x=fix(p/10);y=rem(p,10);z=10*y+xm=length(z);v=max(z);for j=2:sqrt(v)u=find(rem(z,j)=0&z=j);z(u)=;endzx=input(please input the var:) %x=10:99;z=fun(x)ans = 0 + 1.000005ans = 0 + 1.0000iy2=b/(d+f)y=;for x=-5:0.1:5;if x=0y=y,(x+sqrt(pi)/exp(2);else y=y,1/2*log(x+sqrt(