(-3/4)-(-1/2)+3/4+(-8.5)过程?
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(-3/4)-(-1/2)+3/4+(-8.5)过程?
(-3/4)-(-1/2)+3/4+(-8.5)过程?
(-3/4)-(-1/2)+3/4+(-8.5)过程?
(-3/4)-(-1/2)+3/4+(-8.5)
=-3/4+0.5+3/4-8.5
=(-3/4+3/4)+(-8.5+0.5)
=0-8
=-8