组成只读二个0的七位数有14个,分别是:
9080700,8090700,7080900,8070900,
9080070,8090070,7080090,8070090,
9000807,9000708,8000709,8000907,
7000809,7000908。
0087.0089.0078.0079.0098.00789.00879.00987.00897.00978.8007.7008.8009.9008.9007.7009.0097
8700900 7800900 9800700 8900700 9700800 7900800 六个吧
9070800 7090800 8070900 9080700一次类推等等很多的