国贸宾馆有两栋大楼，分别有8层和12层，每层都有20个房间．你来当经理，你准备怎样给这么多房间编号，使你的顾客拿到房间号就能明白自己房间的具体位置．把你的想法写出来，并举例说明．
直接写出得数．+=﹣+=+=﹣=+=+=++=﹣=+= 3﹣﹣=
直接写出得数﹣=﹣=﹣=+=+=﹣=+=﹣=
直接写出得数．+=﹣=+=﹣= 10﹣﹣=====．
直接写得数===== 1﹣= 1﹣==
直接写出得数.+= 1﹣=﹣= 2.5×3.8×4=+= 10﹣9.12=+0.25= 0.65×9+0.65=
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