Tính 3-9/4 = ;7/6-4/5 = ;1/2 :4/5 = ;9/8:5/7=

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1. 3 – 9/4 = 12/4 – 9/4 = 3/4

   7/6 – 4/5 = 35/30 – 24/30 = 11/30

   1/2 : 5/5 = 1/2 : 1 = 1/2

   9/8 : 5/7 = 9/8 x 7/5 = 63/40

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