2 1\2 * 4 1\2 : 2 3\6= 5/2* 9/2: 15/6= 45/4:15/6=45/4:6/15= 9/2= 4,5
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2 1\2 * 4 1\2 : 2 3\6= 5/2* 9/2: 15/6= 45/4:15/6=45/4:6/15= 9/2= 4,5