...a,b,c,d,e; printf("please enter a,b,c,d :\n"); scanf("%d%d%d...答:原来是else那里少了括号,还有scanf那里多了个%d...改正如下:include<stdio.h> main(){ int a,b,c,d,e;printf("please enter a,b,c,d :\n");scanf("%d%d%d",&a,&b,&c,&d);if (a<b)a=a;else {e=a;a=b;b=e;} if (a<c)a=a;else {e=a;a=c;c=e;} if (a<d...
...ti>0(i=1,2,3,...,n)且∑(i=1)ti=1.证:至少存答:因为xi为区间[a,b]上的n个点,不妨取a≤x1<x2<...<xn≤b 记P=max{f(x1),f(x2),...,f(xn)},Q=min{f(x1),f(x2),...,f(xn)},则P≥Q 1. 若P=Q,即f(x1)=f(x2)=...=f(xn),此时P=Q=t1*f(x1)+t2*f(x2)+...+tn*f(xn)取x2,x3,...,x{n-1}中...