(18.6×9.0×3.29+11.8×3.88)/(18.6×(9+5.5)+40)
    √((6×38.17)/(18.6×（1.32×1.59-0.63）))
    (119.66×2.013)/(（4.0+2.31）)
    {40+18.6*5.5}×0.63-2×11.8×√0.63
    √((120.68/1.22)^2+〖68.96〗^2 )
    (811.0×10^3)/(7×4×420)
    (811.0×10^3)/(2×7×480)
    0.677×(27.58×900^4)/(100×9350×8333330)
    (33.16×10^3×125000)/(8333330×100)
    0.6×37.58×0.725+0.617×37.58×0.725
    (2.18×10^6)/166667
    0.1×37.58×〖0.725〗^2+0.177×2.15×〖0.725〗^2
    1.0×[1.0×(1.0+0.40+130)+1.0×(2.5+4)]×0.2
    1.1×1.5×(2.5+4)×0.2
    1.1×1.3×(1.0+0.40+130)×0.2
    .1×1.3×(1.0+0.40+130)×0.2
    (7.5×10×7×0.1×0.1)/(1.3×10)
    arctan2+arctan4+arctan(-1/3)
    5/sqrt(170)
    arctan(1/2)+arctan(1)+arctan(1/3)

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