有一个数，它的千万位和万位上都是1，百位上为3，其余各位上都是0，那么这个数应该是 ．
× = ×= × =1．
任何一个数（零除外）与它的倒数的乘积是1． ．
和 互为倒数．
× =× =× =9× =1．
35× =0.5× =× =6÷ =1．
× = ×
= × =1．
× =
× =
× =9× =1．
× =6÷ =1．
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