简便运算:97×97/98

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简便运算:97×97/98简便运算:97×97/98简便运算:97×97/9897×97/98=(98-1)×97/98=98×97/98-97/98=97-97/98=96又1/98(98-1)^2

简便运算:97×97/98
简便运算:97×97/98

简便运算:97×97/98
97×97/98
=(98-1)×97/98
=98×97/98-97/98
=97-97/98
=96又1/98

(98-1)^2/98=(98^2-2*98+1)/98=98-2+1/98=96又1/98

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