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)
    0.677×(137.5×200^4)/(100×206000×83333)
    (0.83×10^6)/16667
    0.1×187.33×〖0.2〗^2+0.177×10.73×〖0.2〗^2
    1.0×[1.0×(1.0+130)+1.0×(2.5+4)]×1
    1.1×1.3×(1.0+130)×1
    3093.8×3560×10^(-6)
    (0.677×6.2×〖0.9〗^4)/(100×9000×8.333×10^(-6) )
    1.5×4.63/0.01×10^(-3)
    0.86/(1.667×10^(-1) )
    0.6×5.8×0.9+0.617×2.7×0.9
    0.1×5.8×〖0.9〗^2+0.177×2.7×〖0.9〗^2
    1.1×(0.6×26+0.135+0.36+2+2.5+2)×0.25×1

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