乘法999999999×123456789﹦?
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乘法999999999×123456789﹦?乘法999999999×123456789﹦?乘法999999999×123456789﹦?123456789乘以999999999=123456789乘
乘法999999999×123456789﹦?
乘法999999999×123456789﹦?
乘法999999999×123456789﹦?
123456789乘以999999999
=123456789乘以(1000000000-1)
=123456789乘以1000000000-123456789乘以1
=123456789000000000-123456789
=123456788876543211