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65×3/64-5/30×3/10
=(64+1)×3/64-1/20
=64×3/64+1×3/64-1/20
=3+3/64-1/20
=3+(3/64-1/20)
=3+(15/320-16/320)
=3-1/320
=2又319/320
=(64+1)×3/64-1/20
=64×3/64+1×3/64-1/20
=3+3/64-1/20
=3+(3/64-1/20)
=3+(15/320-16/320)
=3-1/320
=2又319/320
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