1.8x[6又5/12除以16+(9-2又7/12)]除以2又3/4

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1.8x[6又5/12除以16+(9-2又7/12)]除以2又3/4
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1.8x[6又5/12除以16+(9-2又7/12)]除以2又3/4
1.8x[6又5/12除以16+(9-2又7/12)]除以2又3/4

1.8x[6又5/12除以16+(9-2又7/12)]除以2又3/4
1.8×[6又5/12÷16+(9-2又7/12)]÷2又3/4
原式=1.8×[6又5/12÷16+(8又12/12-2又7/12)]÷2又3/4
=1.8×(6又5/12÷16+6又5/12)÷2又3/4
=1.8×(6又5/12×1/16+6又5/12×1)÷2又3/4
=1.8×6又5/12×(1/16+1)÷2又3/4
=1又4/5×6又5/12×17/16×4/11
=9/5×77/12×17/16×4/11
=357/80