1个是【10】个0.1 是【100】个0.01 是【1000】个0.001
1个是10个0.1,是100个0.01,是1000个0.001
1里面有10个0.1,100个0.01,1000个0.001
10个0.1,100个0.01,1000个0.001
十个百个千个