【74由几个1几个5几个10几个20组成】
var num = 74;
for(one = 0; one <= num; one++){
for(five = 0; five <= num/5 ; five++){
for(ten = 0; ten <= num/5 ; ten++){
for(twenty = 0; twenty <= num/20; twenty++){
if(one + five*5 + ten*10 + twenty*20 == num){
console.log(one + "个1，" + five + "个5，" + ten +"个10，" + twenty + "个20组成。");
}
}
}
}
}