7/8-3/10 7/20-3/40 3/4+5/7 5/9-5/12 3/4+1/5 7/6-1/3 10/11-2/3 5/8-13/24 1/5+7/10
    3/8十3/7
    1/3+2/5
    1/2+3/4
    1/2+2/3
    130/21+100/3
    1/2-25/63
    1/56-1/280
    3/200-1/84
    1/84-3/200
    1/56-1/350
    1/60-1/210
    1/60-1/210
    1/56-1/280
    9/8-8/3
    26/32÷23/69
    32/26÷23/69
    32/26÷69/23
    21/11×44/18
    21/11×11/4

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