(-1/4)+5/6+2/3-1/2

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(-1/4)+5/6+2/3-1/2
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(-1/4)+5/6+2/3-1/2
(-1/4)+5/6+2/3-1/2

(-1/4)+5/6+2/3-1/2
(-1/4)+5/6+2/3-1/2
=5/6+4/6-1/4-2/4
=3/2-3/4
=3/4

答案3/2

3/2