怎样简便怎样算:
15.2+0.9+0.1=____;8.15-2.85-1.15=____;19.92+4.8-9.92=____;
48.67-(5.67+0.9)=____;7.5+2.5-7.5+2.5=____.
答案
16.2,4.15,14.8,42.1,5
知识点:整数加法运算定律推广到小数

略

略
