{int a1=3,a2=9;printf("%d\n",(a1,a2));} 与{int a1=3,a2=9;printf("%d\n",a1,a2);}有什么区别,怎么解释

#include class A { public:A(int i,int j) { a1=i; a2=j; } virtual void Print() { cout main() { int a1,a2,x; a1=10;a2=20;x=a1*a2; printf(a1=%d,a2+%d ,a1,a2); print(x%d ,x) }本人在自学C语言,英语又差, {int a1=3,a2=9;printf(%d ,(a1,a2));} 与{int a1=3,a2=9;printf(%d ,a1,a2);}有什么区别,怎么解释 #include void main(void) {int a1=10,a2=3; float a3=8.0; cout void fun(char *a1,char *a2,int n) { int k; for(k=0; k main() { int a1,a2,x; a1=100; a2=50; x=a1-a2; printf(x=%d ,x); } 这个C语言程序有错吗? 各位大侠谁能帮我注释一下,class Bubble { public static void main(String[] args) { int[] a = {6,3,2,6,3,2,9,7}; sort(a); print(a); } private static void print(int [] a) { for(int i:a)System.out.print(i + ); System.out.println(); } privat 下列数组定义正确的是 A.int a1[2][ ]; B.int a3[ ][3]; C.int a[2][ ]={1,2,3}; D.int a2[ ][2]={{1},{2}} #define F(m,n) m*n main() { int x=5,y=3,a1,a2; a1=F(x+y,x-y)(x-y,x+y); printf(%d,%d ,a1,a2); }#define F(m,n) m*n main() { int x=5,y=3,a1,a2; a1=F(x+y,x-y);a2=(x-y,x+y); printf(%d,%d ,a1,a2); }不好意思 打错了 设a1,a2,a3均为3维列向量,A＝（a1,a2,a3）.B＝（a1+a2+a3,a1+2a2+4a3,a1+3a2+9a3）,|A|=1,则|B|=_____ 三个正整数a1,a2,a3,且a1+a2+a3=a1×a2×a3,a1≥1,a2≥2,a3≥3,求a1,a2,） Excel 中若A1>=小数：几点5,则A2=ROUND（A1,0）,否则A2=INT（A1）应该如何用公式表达? a1、a2、a3、a4为列向量若|a1 a2 a3|=3,|a4 a2 a1|=2,则|a1+a4+a3 a1 a2|= 已知向量组a1,a2,a3线性无关,则下列向量组中线性无关的是 Aa1,3a3,a1,-2a2 Ba1+a2,a2-a3,a3-a1-2aA：a1,3a3,a1,-2a2 B：a1+a2,a2-a3,a3-a1-2a C：a1,a3+a1,a3-a1 D:a2-a3,a2=a3,a2 设a1,a2,a3为正数,求证a1*a2/a3+a2*a3/a1+a3*a1/a2>=a1+a2+a3 #include #define S(x) x*x main() {int a=9,k=3,m=2; a/=S(k+m)/S(k+m); print(%d,a); |a1,a2,a3|=3,则|a1+a2,2a1,a2-a3|这个行列式怎么算的 A,B是矩阵,A=(a1,a2,a3),B=(a1+a2+a3,a1+2a2+4a3,a1+3a2+9a3),如果|A|=5,那么|B|=