(9+9²+9³)×0.01 简便计算

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(9+9²+9³)×0.01 简便计算
(9+9²+9³)×0.01 简便计算

(9+9²+9³)×0.01 简便计算
(9+9²+9³)×0.01
=9×(1+9(1+9))×0.01
=9×91×0.01
=819×0.01
=8.19

=9*[1+9(1+9)]*0.01
=9*91*0.01
=819*0.01
=8.19

(9+9²+9³)×0.01
=9×(1+9+81)×0.01
=9×91×0.01
=819×0.01
=8.19