27.9×9.9＋2.79 简便计算

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27.9×9.9＋2.79 简便计算
27.9×9.9＋2.79 简便计算

27.9×9.9＋2.79 简便计算
27.9×9.9＋2.79
=27.9×9.9+27.9×0.1
=27.9×（0.1+9.9）
=27.9×10
=279

=2.79×99+2.79
=2.79×（99+1）
=2.79×100
=279

27.9*（9.9+0.1）=279

27.9x9.9+2.79
=27.9x9.9+27.9x0.1
=(9.9+0.1)x27.9
=10x27.9
=279

27.9×9.9＋2.79
=27.9×9.9+27.9×0.1
=27.9×（9.9+0.1）
=27.9×10
=279

27.9×(10-0.1)+2.79

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