(18/5-2)(18/5-6)/(-21/5+3)(-21/5+1)
    (18/5-2)/(-21/5+3)
    (18/5-6)/(-21/5+1)
    -4×21/5-8×18/5+19
    (120191.92-5.7213B)^(2)+0.376163(120191.92B-5.7213B^(2))+0.110363B^(2)-14375.13B
    0.475x^3+0.000516x^2-1.2=81.17x
    0.475x^2+0.000516x-1.2(x^-1)=81.17
    1.078×0.67×217.125×(0.524+0.455+0.388+0.340+0.273+0.225+0.158+0.110+0.43)
    1.078×0.67×217.125×(0.277+0.515+0.534+0.295)
    (0.291×2.5+0.248×1.5+0.206×0.5-1.5)×2
    (-0.145×2.5-0.091×1.5+0.036×0.5)×2
    (0.345×2.5+0.291×1.5+0.236×0.5-2.5)×2
    0.345×2.5+0.291×1.5+0.236×0.5-2.5
    1/2 (10.5×1/2×37×1+1.2×240×1)
    1/2 (10.5×1/2×37×1+240×1)
    1062.93+294.24
    1.0×1.25×1.1×0.45×10^(-3)×200×1021.6×√((2+0.6×2.80)×√50×0.00754×360)
    100×(2240+16890)/(200×1021.6)
    0.51×10^(-3)×√50×350×1021.6
    0.50×10^(-3)×1.25×1.83×200×1021.6

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