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(6/5-3/4)X(5/6+3/4)
=6/5X5/6-3/4X5/6+6/5X3/4-3/4X3/4
=1-15/24+18/20-9/16
如果是(6/5-3/4)X(5/6+4/3)
=6/5X4/3-5/6X3/4
=24/15-15/24
=8/5-5/8
=39/40
=6/5X5/6-3/4X5/6+6/5X3/4-3/4X3/4
=1-15/24+18/20-9/16
如果是(6/5-3/4)X(5/6+4/3)
=6/5X4/3-5/6X3/4
=24/15-15/24
=8/5-5/8
=39/40
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