1/2dm=10/20dm
3/2dm=30/20dm
1/4dm=5/20dm
3/5dm=12/20dm
mà 5<10<12<30
nên 1/4dm<1/2dm<3/5dm<3/2dm
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1/2dm=10/20dm
3/2dm=30/20dm
1/4dm=5/20dm
3/5dm=12/20dm
mà 5<10<12<30
nên 1/4dm<1/2dm<3/5dm<3/2dm