3.39+4.47+3.51-2.38+4.53-2.62
问题描述:
3.39+4.47+3.51-2.38+4.53-2.62
答
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