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Ta có:13 số 25 ;22 số 8;31 số 9
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ta có:2513nhân 822nhân 931và nhân 99999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999999=781384348273568564765837461897348956471398518964598713986891658437938178394698195917658173893519196976891466984316891781,369216473981589476198611487
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