Mathematics
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    1/7+1/8
    16/124
    10000*8%-(1-25%)/10000*(1-1.5%)
    3[9/4+2(4/9+1-2)]-3(9/4+8/9)+4*3/2
    12/31×23/43
    12/34×23/43
    3/4×2/3
    3/4×0.6
    1/4-1/48
    1/4-1/(4+2)
    1/4-1/9-2/3
    1/9+1/11+1/13+1/15
    3/21-2/24
    7m^2-2m-2=0
    m^4-20m^2+80=0
    0.6X/30+X=60%
    0.6X/30+X=60%
     56÷(100X)+40÷(84-84X) = 1÷2
    4/920+2/600=
    5/6-3/4

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