(59×5+1 250)=1545即1545×(1+R)-5=1 000 1545×(1+R)=10051+R=67/103R=-36/103
1+R=1005/(59x5+1250)变换1+R=201/(59+250)=201/309 约分51+R=67/103 约分3R=67/103-1=-(63/103)计算
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