$x^2$
$$f_{X_1,\cdots, X_k}(x_1, \cdots, x_k)=\overbrace{\int_{-\infty}^{\infty} \cdots \int_{-infty}^{\infty}}^{n-k} f(x_1, \cdots, x_k, \xi_{k+1}, \cdots, \xi_{n})d \xi_{k+1} \cdots d\xi_{n}$$
$\cancel{R} $
$\cancel{R} $
#include "stdafx.h" #includevoid main() { void hanoi(int n,char one,char two,char three); int m; printf("input the numbers of diskes:"); scanf("%d",&m); printf("The steps to move %d diskes:\n",m); hanoi(m,'A','B','C'); getch(); } void hanoi(int n,char one,char two,char three) //定义hanoi函数 { void move(char x,char y); if(n==1) move(one,three); else { hanoi(n-1,one,three,two); move(one,three); hanoi(n-1,two,one,three); } } void move(char x,char y) //显示移动操作 { printf("%c-->%c\n",x,y); }