根据题意,采用加减法的交换律进行简便运算,原式=3.75-1.25+6.25-0.75=(3.75+6.25)-(1.25+0.75)=10-2=8,所以原式等于8
原式=3.75-0.75+6.25-1.25
=(3.75-0.75)+(6.25-1.25)
=3+5
=8
3.75-1.25+6.25-0.75
=3.75-0.75+6.25-1.25
=3+5
=8
运用加减法结合律改变运算顺序结果保持不变,所以原式等于(3.75+6.25)-(1.25+0.75)=10-2=8
3.75-1.25+6.25-0.75
=(3.75-0.75)+(6.25-1.25)
=3+5
=8