6.75-(-1/2)+(-14/3)+(-0.5)+(-6又3/4)

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6.75-(-1/2)+(-14/3)+(-0.5)+(-6又3/4)
6.75-(-1/2)+(-14/3)+(-0.5)+(-6又3/4)

6.75-(-1/2)+(-14/3)+(-0.5)+(-6又3/4)
6.75-(-1/2)+(-14/3)+(-0.5)+(-6又3/4)
=6.75+1/2-14/3-0.5-6又3/4
=(6.75-6又3/4)+(1/2-0.5)-14/3
=0+0-14/3
=-14/3

6.75-(-1/2)+(-14/3)+(-0.5)+(-6又3/4)
=[6.75+(-6又3/4)]+[-(-1/2)+(-0.5)]+(-14/3)
=-14/3

=[6.75+(-6又3/4)]+1/2-0.5 -14/3
=0+0-14/3
=-14/3