上式=(-3.5)+3.5+(-2又1/9)+(-8/9)
=0+(-2-1/9)-8/9
=-2-(1/9+8/9)
=-2-1
=-3
=0+(-2-1/9)-8/9
=-2-(1/9+8/9)
=-2-1
=-3
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第1个回答 2020-08-23
（-3-1/2）+（-2-1/9）+3.5-8/9
=-3-1/2-2-1/9+3.5-8/9
=-3-2+3.5-1/2-1/9-8/9
=-3
=-3-1/2-2-1/9+3.5-8/9
=-3-2+3.5-1/2-1/9-8/9
=-3
第2个回答 2020-08-23
=-3-1/2-2-1/9+3+1/2-8/9
=-3+3-1/2+1/2-2-1=-3
=-3+3-1/2+1/2-2-1=-3
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