8╱7－6╱5
    4/3+5/3
    2/3 - 3/8
    3/5+5/3=
    37373737/73737373*9/3
    35/47-12/23
    2/11+5/12；2/3+3/4+4/5；2/7+4/9+2/3+1/5
    1/2+3/5；4/7*5/9；6/6/3/4；5/11-2/12；7/4*1/2；5/6/4/3
    9/4*4/3
    1/3+2/4=
    1/3+2/4
    3/10 ÷1/20
    11111111/9999999999999999*99999999/1111111111111111
    1/8+111111111/888888888
    3030303/10101010+4040404/10101010
    3/88888888*44444444/5
    22/333*111/55；888/999+222/333
    1/2+2/3；3/4+4/5；5/6+6/7；7/8+8/7；7/6+6/5；5/4+4/3；3/2+2/1
    1/2+3/5；12/6+3/7；4/4+5/5；18/2-7/4；2/3*5/8；7/2/3/5
    2/3*3/4

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