arcsin0.5
    √((80.94/270)^2+(91.42/155)^2 )
    (718×10^3×166)/(15×(π×100^3)/32)
    (718×10^3)/(1×π×100^2/4)
    19.796-(0.049+0.049)/2
    (39.7×10^6)/(0.88×236865.58×215)
    23.388-(19.801+19.252)/2
    (3.15×10^6)/16667
    0.1×85.06×〖0.55〗^2+0.177×10.73×〖0.55〗^2
    1.1×{1.5×(2.5+4)}×1
    1.1×{1.3×(0.785+1.5+57.2)}×1
    1.1×(1.0×0.785+1.0×2.5)×1
    1.1×(1.3×0.785+1.5×2.5)×1
    (1000×6^2)/6
    (1000×6^3)/12
    1.0×{1.0×(0.785+1.5+57.2)+1.0×(2.5+4)}×1
    1.1×{1.3×(0.785+1.5+57.2)+1.5×(2.5+4)}×1
    ［1-1/（1+8.0%）^32.13］/［1-1/（1+8.0%）^40］
    √((80.23/270)^2+(90.62/155)^2 )
    (711.7×10^3×166)/(15×(π×100^3)/32)

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