1. It is best to stagger the repayment dates of these three credit cards. For example, the repayment date of credit card A is set to the 1st of each month, the repayment date of credit card B is set to the 15th of each month, and the repayment date of credit card C is set to the 30th of each month. 2. When credit card A reaches the 1st date, he needs to repay 1,000 yuan...