3.75+2.43+1.25+0.57=(3.75+1.25)+(2.43+0.57)=5+3=8
3.75+2.43+1.25+0.57=3.75+1.25+2.43+0.57=(3.75+1.25)+(2.43+0.57)=5+3=8
3. 75十1. 25十(2. 43十0. 57)=8
加法交换律和结合律的题目3.75+2.43+1.25+0.57=3.75+1.25+(2.43+0.57)=5+3=8