3/5+2/5
    3/4+3/8
    1/5×5/3
    1/2+1/3
    4/2+1/4
    1/2-5/2
    2/3+5/6
    7/6+2/9
    2/3+5/3
    1/8+5/8
    26/15-14/15
    32/12-13/12
    1/3-1/15=
    1/3+1/15=
    1/2＋3/7 3/7－1/4 6/11×1/3 2/5÷8/9
    466/546+234/7846
    4/15＋5/6
    1/3＋3/4
    1/199999999999＋1/200000000001
    2/22-1/22=

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