2-6/13-1/26,减2/3等于几?
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解:2-6/13-1/26-2/3
=2-(6/13+1/26)-2/3
=2-(12/26+1/26)-2/3
=2-13/26-2/3
=2-1/2-2/3
=2-3/6-4/6
=12/6-3/6-4/6
=5/6
=2-(6/13+1/26)-2/3
=2-(12/26+1/26)-2/3
=2-13/26-2/3
=2-1/2-2/3
=2-3/6-4/6
=12/6-3/6-4/6
=5/6
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