有理数加减法运算-0.5-(-3 1/4)+2.75-(+7 1/2)怎么解?

分类: 作业答案 • 2021-12-31 14:31:30

问题描述：

答

-0.5-(-3 1/4)+2.75-(+7 1/2)
=-0.5+3.25+2.75-7.5
=-(0.5+7.5)+(3.25+2.75)
=-8+6
=-2