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20分之7÷(9分之8-12分之5)×10分之9 =20分之7÷(36分之32-36分之15)×10分之9 =20分之7÷36分之17×10分之9 =20分之7×17分之36×10分之9 =85分之63×10分之9 =850分之567
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