99×98分之9等于多少?

问题描述:

99×98分之9等于多少?

99×98分之9
=99×9/98
=(98+1)×9/98
=98×9/98+1×9/98
=9+9/98
=9又98分之9

=9.0918367346938775510204081632653

99×98分之9
=(98+1)×98分之9
=98×98分之9+1×98分之9
=9+98分之9
=9又98分之9

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99×98分之9
=(98+1)×98分之9
=98×98分之9+1×98分之9
=9+98分之9
=9又98分之9