3/2:9/4=3/2x4/9=12/18=2/3=40/60
48/55:12/11=48/55x11/12=4x/15=4/5=48/60
7/10:7/5=1/2=30/60
6/7:8/7=3/4=45/60
mà 30<40<45<48
nên 1/2<2/3<3/4<4/5
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