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=104/105
2)[9/10:3/6]+5/8=[9/10×6/3]+5/8= 6 /5+5/8
=48/40+25/40=73/40=1 33/40
3)60%-0,20+1,45=
60/100-20/100+1 45/100=
40/100+1 45/100=1 85/100
4)72%+36%-41%=72/100+36/100-41/100
=108/100-41/100=67/100
5)[10:3/5]×4/8=[9/9×5/3]×4/8=15/9×4/8
=60/72