1/11-1/22
    1/7+4/5
    56/7-56/9
    1/520-1/1314
    1/6/4/6
    25/30-1/6
    2/3+3/3
    1/4乘1/6
    1/3乘1/8
    23/35＋15/49
    13/35*14/39
    13/15*35/33
    1/9-1/12
    3/15200-3/11200=
    2/5＋5/9
    2/2/2/3
    8/19-5/38
    5/11-5/13
    2/69+2/71
    2/3*8/9

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