floata，b，c，问等式（a+b）+c==（b+a）+c和（a+b）+c==（a+c）+b能否成立？
#include main(){ float a,b,c,t;a=3;b=7;c=1;if(a>b){t=a;a=b;b=t;}if(a>c){t=a;a=c;c=t;}if(b>c){t=b;b=c;c=t;}printf(%5.2f,%5.2f,%5.2f,a,b,c);}运行结果为（ ）
有以下程序段 int a, b, c; a=10; b=50; c=30; if (a>b) a=b, b=c; c=a; printf(a=%d b=%d c=%d”, a, b, c); 程序的输出结果是（ ）。
语句后,a,b,c的值分别为（ ）。int a,b,c;a=b=c=1;++a||++b&&++c;
当a,b,c的值分别为3，4，5时，以下各语句执行后a，b，c的值为多少（ ）if (a>c){a=b; b=c; c=a;}else{a=c; c=b; b=a;}printf(“%d,%d,%d”,a,b,c);
编写程序，输入3个整数a、b、c，输出时：a的值是b，b的值是c，c的值是a。下面程序可以正确实现题目要求：#include int main(){int a,b,c,tscanf(\%d%d%d\,&a,&b,&c);t=a;a=b;b=c;c=t; // 顺序交换a、b、cprintf(\a=%d,b=%d,c=%d\,a,b,c);return 0;}
智慧职教: (A ∪ B) ∪ C = A ∪ (B∪C) = A ∪ B∪C
设有定义：int a=1,b=2,c=3;以下语句中执行效果与其他三个不同的是A) if(a>b) {c=b,a=b,b=c;}B) if(a>b) {c=a,a=b,b=c;}C) if(a>b) c=a;a=b;b=c;D) if(a>b) {c=a;a=b;b=a;}
a、b、c三个数，已知a×b＝24，a×c＝36，b×c＝54，求a+b+c＝()。
根据所听到的内容作答_____. A)They have to learn basics of English． B)They know clearly what they want to learn． C)It is good for them to learn general English skills． D)They want to have an up-to-date knowledge of English．
表示关系a≤b≤c的C语言表达式为（)。A．（a＜=B) &&（b＜=C)B．（a＜=B) and（b＜=C)C．（a＜=b＜=C)D．（a＜
若三个向量a，b和c满足条件a+b+c=0，且|a|=3，|b|=1，|c|=4，则a·b+b·c+c·a=______．
设a，b，c为单位向量，且满足a+b+c=0，求a·b+b·c+c·a
——I can't get through to the general manager's office anyhow.<p>——The line is busy. Someone___ the telephone.</p><p>A.must use</p><p> B.uses</p><p>C.must have been using </p><p>D. must be using</p><p><br></p>
设为一个半群,a,b,c为S中的给定元素.证明:若a,b,c满足a*c=c*a,b*c=c*b那么（a*b)*c=c*（c*b).
听力原文： When people succeed, it is because of hard work, but luck has a lot to do with it, too. Success without some luck is almost impossible. The French emperor Napoleon said of one of his generals, "I know he's good. But is he lucky？" Napoleon knew that all the hard work and talent in the world can't make up for bad luck. However, hard work can invite good luck..
A. They are afraid that they would again be isolated from American society in general. B ) People would think that Asian students rely on their parents for success. C ) Asian American would be a threat to other minorities.
【单选题】5、设[{a , b , c}，*]为代数系统，*运算如下： * a b c a a b c b b a c c c c c 则零元为（）。
当a=3,b=2,c=1;时,执行以下程序段后a=【】.if（a＞b)a=b;if（b＞c)b=c;elsec=b;c=a;
有以下程序段：int a,b,c;a=10;b=20;3=30;a=b;b=c;c=a;printf(“a=%d,b=%d,c=%d\n”,a,b,c);
有以下程序：includeint main（）{ int a, b, c[10] = { 0,1,2,3,4,5,6,7,8,9 }; for （a = 0; a＜10; ++a） { for （b = 0; b＜5 – a; ++b）{ if （c[b] ＜ c[b+1]） { c[b] += c[b + 1]; c[b + 1] -= c[b]; c[b] += c[b +
当a，b，c的值分别为3，4，5时，以下各语句执行后a，b，c的值为多少？if（a＞c）{a=b;b=c;c=a;}else {a=c;c=b;b=a;}（）
设A={a，b，{a，b}，c}，B={b，{b，c}，{a}}，求A－B，B－A，A B．设A={a，b，{a，b}，c}，B={b，{b，c}，{a}}，求A-B，B-A，A B．
Generally speaking, it is necessary for the buyer to clearly specify a period of validity of the L／C when applying for the opening of L／C.（)
