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ta có: 4/5=16/20 ; 3/4=15/20

Vì 16>15 nên 16/20>15/20 hay 4/5>3/4

Nên trong 1 phút, bạn Hòa chạy nhanh hơn bạn Bình

Hơn số phần đoạng đường là: 4/5-3/4=16/20-15/20=1/20(đoạn đường)

a) Chiều dài mảnh vườn HCN là :

               50 : 5/6= 60 ( cm)

 Chu vi mảnh vườn HCN là :

             (50 + 60) x 2 = 220 ( cm )

b) Diện tích mảnh vườn HCN là :

                 60 x 50 = 3000 ( cm2 )

 Diện tích trồng hoa là :

          3000 x 1/6 = 500 ( cm2 )

hello