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97×97/98怎么简便计算

97*97/98 =(98-1)*(98-1)/98 =(98*98 - 2*98 + 1)/98 =98 - 2 +1/98 =96 + 1/98

=(98-1×97/98) =98×97/98-1×97/98 =97-97/98 =96又1/98

=(98-1)*97/98 =98*97/98-1*97/98 =97-97/98 =96+1-97/98 =96+1/98 =96又98分之1

97除以97又98分之97 =97÷(98x97+97)/98 =97x98÷(97x99) =98/99

=(97+1)×96/97 =96+96/97 =96又96/97

97×3/98 =(98-1)×3/98 =98×3/98-1×3/98 =3-3/98 =2又95/98

99又97/98×49 =(100-1/98)×49 =4900-1/2 =4899又1/2

解:根据拆分法和分配律: 原式=(98+1)x97/98 =98x97/98+1x97/98 =97+97/98 =97又97/98

97×(97÷98) =(98-1)×97/98 =98×97/98-97/98 =97-97/98 =96又1/98 96×(97÷98) =(98-2)×97/98 =98×97/98-2×97/98 =97-97/49 =95又1/49

123×98-124×97 =123×98-(123+1)×97 =123×98-123×97-1×97 =123×(98-97)-97 =123-97 =123-100+3 =26

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