Mathematics
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    7*-1/7
    7*-7
    -0.25*8
    -1/5*1/5
    15*1/3
    (-7)*(-6)
     (100+380)*(1000-2*380)
    (100+20)(1000-2*20)=
    56+56*(53/2)
    3^4
    0.65*1/10^0.5
    0.65*1/14^0.5
    0.65*1/15^0.5
    4-3(100-82)^2/1600
    4-3(100-86)^2/1600
    4-3(100-84)^2/1600
    4-3(100-89)^2/1600
    4-3(100-87)^2/1600
    4-3(100-90)^2/1600
    4-3(100-85)^2/1600

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