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

97x97/98 =(98-1)x97/98 =97-1/98 =96又97/98

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

99乘以97加98用简便计算怎么做 99*97+98 =99*97+97+1 =97*(99+1)+1 =97*100+1 =9700+1 =9701

97x97/98 =(97x98 -97)/98 =97 - 97/98 =96 + 1/98 =96又98分之1

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

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