(-2/3-1/2)-(-1/3+5/6)解答此题,

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(-2/3-1/2)-(-1/3+5/6)解答此题,(-2/3-1/2)-(-1/3+5/6)解答此题,(-2/3-1/2)-(-1/3+5/6)解答此题,(-2/3-1/2)-(-1/3+5/6)=

(-2/3-1/2)-(-1/3+5/6)解答此题,
(-2/3-1/2)-(-1/3+5/6)解答此题,

(-2/3-1/2)-(-1/3+5/6)解答此题,
(-2/3-1/2)-(-1/3+5/6)
=-4/6-3/6+2/6-5/6
=-10/6
=-5/3