(-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

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