48/36 =4/3=1又1/3,
90/54=5/3=1又2/3,
60/84=5/7,
21/35 =3/5,
24/84 =2/7,
51/68=3/4.
解：
48/36=4/3=1(1/3)
90/54=5/3=1(2/3)
60/84=5/7
21/35=3/5
24/84=2/7
51/68=3/4
48/36 =4/3=1又1/3
90/54=5/3=1又2/3
60/84=5/7
21/35 =3/5
24/84 =2/7
51/68=3/4
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