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(-2/3)+(+0.25)+(-1/6)-(+1/2)这题怎么做

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(-2/3)+(+0.25)+(-1/6)-(+1/2)这题怎么做
(-2/3)+(+0.25)+(-1/6)-(+1/2)这题怎么做
=-2/3+1/4-1/6-1/2
=-2/3-1/2+1/4-1/6
=-2+1/4-1/6
=-24/12+3/12-2/12
=(-24+3-2)/12
=-23/12