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

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

人气：335 ℃　时间：2020-02-15 08:52:34

解答

-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