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

1.8x[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