(-21/5+3)^2+(18/5)^2+2×21/5-4×18/5+6
    10+2×21/5-4×18/5
    -21/5+2×18/5-5
    (18/5)^2-8×18/5+12+(21/5)^2-4×21/5+3
    (y-6)(y-2)=1
    (y-6)(y-2)
    (18/5-2)^2+(-21/5+3)^2
    (18/5+3)^2+(21/5-2)^2
    (18/5)^2+(21/5)^2
    (18/5-2)/(-21/5+1)
    [(18/5-2)(18/5-6)]/[(-21/5+3)(-21/5+1)]
    (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)

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