689.472+590.976
    7.2*12*6.840=
    7.2*14*6.840=
    55957×2+70398×10=
    [-(3*(-1.313446)^2)+1-6*(-1.313446)]/[3*(-1.313446)^2+1]
    55943×2+61098×10
    221.616+1101.924=
    295.488+266.76+283.176+256.5=
    12937+15384+15035+12587
    0.37×12×83400/5.35/5.35
    (0.5+0.38)/(2+0.38)=
    7.5*5*6.840=
    0.44×12×83400/5.35/5.35
    (0.5+0.65)/(2+0.65=
    (32100+22200) /83400
    0.43×12×83400/5.35/5.35
    (0.5+0.62)/(2+0.62)=
    (29400+22200)/83400
    6.9*6*6.840=
    0.36×12×83400/5.35/5.35

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