(√((10*0.030)^2+2*10*0.0300)-10*0.0300)*2106.78
    (√((10*0.0301)^2+2*10*0.0301)-10*0.0.0301)*2106.78
    19000/(2106.78*300)
    19000/(300*2100)
    2200-93.22
    (161.53×6+136.7×7+116×14+66.7×7+46×14)/50
    7415.372×10^6/(210*0.92*2100)
    155×(0.86+0.78+0.7+0.62)+1/2×52.7×11.6×0.58+1/2×52.7×0.1×2
    155×(0.875+0.795+0.715+0.635)+1/2×52.7×1.7×0.085+1/2×52.7×0.595×11.9
    155×(0.5+0.42+0.34+0.26)+1/2×52.7×9.2×0.46+1/2×52.7×0.22×4.4
    155×(1+0.92+0.84+0.76)+1/2×0.72×52.7×14.4
    155×(0.5+0.42+0.34+0.26)+1/2×52.7×9.2×0.46+1/2×59.033×0.22×4.4
    155×(4.688+3.688+4.088+3.488)+1/2×52.7×3.188×5.1+1/2×52.7×8.5×3.188
    155×(2.55+3.75+3.35+2.95)+1/2×52.7×1.95×2.6+1/2×52.7×11×2.75
    155×(4.2+5+4.2+3.4)+1/2×52.7×3.8×7.6+1/2×52.7×3×6
    155×(2.188+1.988+1.788+1.588)+1/2×52.7×1.488×1.7+1/2×52.7×11.9×1.488
    155×(4.2+5+4.2+3.4)+1/2×52.7×3.8×7.6+1/2×59.033×3×6
    (1+2/3)*3=
    694.385×20.60/4-67.416×(20.60/4)^2/2
    94.385×(4×20.60)/8-67.416×(20.60/4)^2/2

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