2.61*39.5+28.7*261+9.05*26.1简便计算

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2.61*39.5+28.7*261+9.05*26.1简便计算
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2.61*39.5+28.7*261+9.05*26.1简便计算
2.61*39.5+28.7*261+9.05*26.1简便计算

2.61*39.5+28.7*261+9.05*26.1简便计算
2.61*39.5+28.7*261+9.05*26.1
=26.1×3.95+26.1×287+26.1×9.05
=26.1×(3.95+287+9.05)
=26.1×300
=7830

2.61*39.5+28.7*261+9.05*26.1
=26.1×3.95+26.1×287+26.1×9.05
=26.1×(3.95+287+9.05)
=26.1×300
=7830 这么简单的题都不会晕~~ -_-!