巧算【789+789789+789789789】/【987+987987+987987987】1-2/3-2/9-2/27-2/81-2/243
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巧算【789+789789+789789789】/【987+987987+987987987】1-2/3-2/9-2/27-2/81-2/243巧算【789+789789+789789789】/【98
巧算【789+789789+789789789】/【987+987987+987987987】1-2/3-2/9-2/27-2/81-2/243
巧算【789+789789+789789789】/【987+987987+987987987】
1-2/3-2/9-2/27-2/81-2/243
巧算【789+789789+789789789】/【987+987987+987987987】1-2/3-2/9-2/27-2/81-2/243
【789+789789+789789789】/【987+987987+987987987】
=789*(1+1001+1001001)/[987*(1+1001+1001001)]
=789/987
=263/329
1-2/3-2/9-2/27-2/81-2/243
=1-(1-1/3)-(1/3-1/9)-(1/9-1/27)-(1/27-1/81)-(1/81-1/243)
=1-1+1/3-1/3+1/9-1/9+1/27-1/27+1/81+1/81-1/243
=1-1/243
=242/243
567*789789-789*567567
巧算【789+789789+789789789】/【987+987987+987987987】1-2/3-2/9-2/27-2/81-2/243
567 乘789789减789乘567567,怎样做简便
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