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5 : 2 :1 :5 = 5/9 x 3/2 :1/2 : 5/6
9 3 2 6 =5/6 x 2/1 : 5/6
=5/3 x 6/5
=2
=3/28÷5/14+1/3
=3/28×14/5+1/3
=42/140+1/3
=3/10+1/3
=9/30+10/30
=19/30