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

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有理数加减法运算-0.5-(-31/4)+2.75-(+71/2)怎么解急有理数加减法运算-0.5-(-31/4)+2.75-(+71/2)怎么解急有理数加减法运算-0.5-(-31/4)+2.75-

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

有理数加减法运算-0.5-(-3 1/4)+2.75-(+7 1/2)怎么解 急
-0.5-(-3 1/4)+2.75-(+7 1/2)
=-0.5+3 1/4+2.75-7 1/2
=-0.5+2.75+3 1/4-7 2/4
=2.25-4 1/4
=-2