-1/3-15.5+(-2/3)等于多少,

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-1/3-15.5+(-2/3)等于多少,-1/3-15.5+(-2/3)等于多少,-1/3-15.5+(-2/3)等于多少,-1/3-15.5+(-2/3)=-1/3-15.5-2/3=-（1/3+

-1/3-15.5+(-2/3)等于多少,
-1/3-15.5+(-2/3)等于多少,

-1/3-15.5+(-2/3)等于多少,
-1/3-15.5+(-2/3)=-1/3-15.5-2/3=-（1/3+2/3）-15.5=-16.5

-1/3-15又1/2-2/3=-1-31/2=-2/2-31/2=-33/2=-16.5