75%+3/4*59-0.75
=0.75+0.75×59-0.75
=0.75-0.75+0.75×(60-1)
=0+0.75×60-0.75
=45-0.75
=44.25
75%+3/4*59-0.75
=3/4*(1+59-1)
=3/4*59
=3/4*(60-1)
=45-3/4
=44又1/4
解:原式=0.75+0.75*59-0.75
=0.75*(1+59-1)
=0.75*59
=44.25
75%+3/4*59-0.75
=0.75+0.75×59-0.75
=0.75×60-0.75
=44.25
75%+3/4*59-0.75
=0.75+3/4*(60-1)-0.75
=3/4*(60-1)
=3/4*60-3/4*1
=45-3/4
=44又1/4