第1个回答 推荐于2021-02-01
27.9×9.9＋2.79
=27.9×9.9+27.9×0.1
=27.9×（0.1+9.9）
=27.9×10
=279本回答被提问者采纳
=27.9×9.9+27.9×0.1
=27.9×（0.1+9.9）
=27.9×10
=279本回答被提问者采纳
第2个回答 2011-09-15
27.9×9.9＋2.79
=27.9×9.9+27.9×0.1
=27.9×（9.9+0.1）
=27.9×10
=279
=27.9×9.9+27.9×0.1
=27.9×（9.9+0.1）
=27.9×10
=279
第3个回答 2011-09-15
27.9x9.9+2.79
=27.9x9.9+27.9x0.1
=(9.9+0.1)x27.9
=10x27.9
=279
=27.9x9.9+27.9x0.1
=(9.9+0.1)x27.9
=10x27.9
=279
第4个回答 2011-09-15
27.9*（9.9+0.1）=279
第5个回答 2011-09-15
27.9×(10-0.1)+2.79
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