8.93-2 又11-(1又 1/11*4/23+4/23)
=8.93-2 又711-(1又/11+1)*4/23
=8.93-2 又711-2311*4/23
=8.93-2 又711-4/11
=8.93-(2又7/11+4/11)
=8.93-3
=6.93
8.93-2 又11-(1又 1/11*4/23+4/23)
=8.93-2 又711-(1又/11+1)*4/23
=8.93-2 又711-2311*4/23
=8.93-2 又711-4/11
=8.93-(2又7/11+4/11)
=8.93-3
=6.93