√((25.4)^2+(35.4)^2 )
    √((-31.0)^2+(-45.6)^2 )
    0.964×0.965
    1-0.35×√(1454.0/466470.05)+0.35×√(1454.0/466470.05)×(35.4/(-45.6))
    1-0.35×√(1454.0/466470.05)+0.35×√(1454.0/466470.05)×(25.4/(-31.0))
    8.635-6.409
    (76.7×10^6)/(0.886×1432993.02×215)
    5.081-(4.390+4.376)/2
    5.084-(2.695+3.278)/2
    4.773-4.036
    4.395-(0.125+0.326)/2
    (235.8×10^6)/(0.604×2342086.57×215)
    10.025-8.288
    (44.7×10^3)/(0.991×3555.5×215)+(1.0×6.2×10^6)/(1.05×236865.58×(1-(0.8×44.7)/43792.81)×215)
    (π^2×2.06×10^5×3555.5)/(1.1×〖12.25〗^2 )
    1000/81.62
    10.034-7.467
    (102.6×10^3)/(0.996×3555.5×215)+(0.85×6.1×10^6)/(1.05×236865.58×(1-(0.8×102.6)/131472.87)×215)
    4.397-4.053
    [0.5×(1159.71/102.45+ 142.85/1159.71）-1]×100%

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