（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
=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