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12分之11+3又7分之1+3又12分之1+(5又7分之6-0.123)=12分之11+3又7分之1+3又12分之1+5又7分之6-0.123=12分之11+3又12分之1+3又7分之1+5又7分之6-0.123=(12分之11+3又12分之1)+(3又7分之1+5又7分之6)-0.123=4+9-0.123 =…
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