来自李翠红的问题
【3.39+4.47+3.51-2.38+4.53-2.62】
3.39+4.47+3.51-2.38+4.53-2.62
1回答
2020-03-24 09:52
【3.39+4.47+3.51-2.38+4.53-2.62】
3.39+4.47+3.51-2.38+4.53-2.62
3.39+4.47+3.51-2.38+4.53-2.62
=3.39+3.51+4.47+4.53-2.38-2.62
=6.9+9-5
=10.5