2.219×（1-0.5%）=
    1400*（3.5-0.4×8.6）/（40-0.4×5.35）=
    cos31
    cos30
    sin30
    8/35×5/32+5/35×27/32
    (1.3×10^3-0.3×622.4×10^3)/(0.9×0.44×300)
    0.4×622.4×0.883
    424.5/(2.0×2.0)
    0.34×2.0×125.33
    424.5/(2.0×2.0)
    (10.05×10^6)/(0.9×360×755)
    1/12×〖0.34〗^2×[(2×2.0+2.0)(2×106.13-(2×2.0×2.0×0.8×24)/(2.0×2.0))]
    (424.5+2.0×2.0×0.8×24)/(2.0×2.0)
    424.5/(2.0×2.0)
    (424.5/1.35+2.0×2.0×0.8×24)/(2.0×2.0)
    (1.1×15.95×10^6)/266666.67
    (159.53×0.4)/4
    638.1/4
    √((52.09/1.22)^2+〖4.53〗^2 )

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