99.9×9.99 简便计算
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99.9×9.99简便计算99.9×9.99简便计算99.9×9.99简便计算99.9×9.99=(100-0.1)×9.99=100×9.99-0.1×9.99=999-0.999=998.001请
99.9×9.99 简便计算
99.9×9.99 简便计算
99.9×9.99 简便计算
99.9×9.99
=(100-0.1)×9.99
=100×9.99-0.1×9.99
=999-0.999
=998.001
请点击下面的【选为满意回答】按钮.
=999*999/1000
=（1000-1）^2 /1000
原式=(100-0.1)×9.99
=100×9.99-0.1×9.99
=999-0.999
=998.001
=（100-0.1）×（10-0.01）=1000-1-1+0.001=998.001