6789乘6789-6790乘6788简算急阿

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6789乘6789-6790乘6788简算急阿6789乘6789-6790乘6788简算急阿6789乘6789-6790乘6788简算急阿6789乘6789-6790乘6788=6789*6789-(

6789乘6789-6790乘6788简算急阿
6789乘6789-6790乘6788简算
急阿

6789乘6789-6790乘6788简算急阿
6789乘6789-6790乘6788
=6789*6789-(6789+1)(6789-1)
=6789*6789-6789*6789+1
=1

6789×6789-6790×6788
=6789×6789-(6789+1)×(6789-1)
=6789×6789-(6789×6789-1)
=1