7.47×10×5
    10.87×10×5
    7.91×10×5
    17.67×10×5
    1/（(1/1679.73608）×（1.02913/0.02827）+（0.0005/393）×（1.02913/0.029845）+0.004+0.0001+1/(71.4203×0.870819))
    1/(1/1679.73608×1.02913/0.02827+0.0005/393 1.02913/0.029845+0.004+0.0001+1/(71.4203×0.870819))
    2.5×10^(-3)-(-0.00070×4.0)+1.327×10^(-3)+2.655×10^(-3)
    543.93/(2×0.316×0.8×3×10^7×0.189)×[〖3.4〗^2+0.316×1.0×(2×3.4+1.0)]
    105.91/(0.316×0.8×3×10^7×0.189)[1/3 (0.316×1^3+〖3.4〗^3 )+0.316×3.4×1×(3.4+1)]
    π×〖0.8〗^2+10×45.24×10^(-4)
    sqrt(2.7726)
    (-0.65)*2000000^(0.35)*(1000000/3)^(-0.35)
    (-0.65)*2000000^(0.35)*(1000000/3)^(-0.65)
    (-0.65)*2000000^(0.65)*(1000000/3)^(-0.65)
    0.35*2000000^(-0.65)*(1000000/3)^(0.65)
    500*(2.4-0.85-0.15)+1500*(1.2-0.85-0.15)+1500*(8-2.8-0.4)-3700-1650
    8756.91+15.08×41.8
    1/2×5.184×[(1.49×25)+(1.56×40)+(6.22×22)+(10.93×60)+(41.8×55)]+0.75×0.8×2.01×[400+1.5×8×(20.2+41.8-3)]
    π×〖0.8〗^2×(25-10)
    1.0×1.0×1.1×0.45×10^(-3)×1400×1550×√((2+0.6×0.7948)×√40×0.002594×250)

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