4   +   5 ;     / /   K t   q u   l    9 . 
 
 x   +   y ;     / /   C n g   x   v    y   v i   n h a u . 
 
 5   -   1 ;     / /   K t   q u   l    4 . 
 
 
 
 v a r   a N u m   =   9 4 7 ;   
 
 v a r   a S t r =   " R u s h " ;   
 
 v a r   a n o t h e r N u m   =   5 3 ;   
 
 v a r   a S t r N u m   =   " 4 3 " ; 
 
 v a r   r e s u l t 1   =   a N u m   +   a S t r ;       / /   K t   q u   s   l    c h u i   " 9 4 7 R u s h " ; 
 
 v a r   r e s u l t 2   =   a N u m   +   a n o t h e r N u m ;     / /   r e s u l t 2   s   l    s   1 0 0 0 ; 
 
 v a r   r e s u l t 3   =   a N u m   +   a S t r N u m ;     / /   r e s u l t 3   s   l    c h u i   9 4 7 4 3 ; 
 
 
 
 v a r   a N u m   =   9 4 7 ;   
 
 v a r   a S t r N u m   =   N u m b e r ( " 4 3 " ) ; 
 
 v a r   r e s u l t 3   =   a N u m   +   a S t r N u m ;     / /   r e s u l t 3   s   l    9 9 0 ; 
 
 
 
 
 
 
 
 