1:What can we do2:What's the use of3:download4:因为根号x-3·根号5-x有意义,所以3≤x≤5因为x是整数,所以x=3,4或5所以根号x-3·根号5-x在x=3时,为0;在x=4时,为1;在x=5时,为0所以选C
what can we dowhat can we do withdownload A
1:What can we do2:What is the use of3:download4:D(答案为345)