which of these fraction are proportional relationship, 1/2 and 2/3, 1/2 and 2/4, 3/4 and 9/12, 5/4 and 2/3, 4/5 and 20/25, 1/7 and 33/50, which of these are are nonproportional relationship, 3/4 and 10/15, 3/4 and 9/12, 3/2 and 6/4, 4/5 and 20/25, 6/7 and 13/20, 8/9 and 16/18

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