（2.29*15+2.93*20.3+2.3*10+6.65*16.4+2*19+5*19.6+9.77*40+4.11*40）/35.5=
    （1/3）^2*0.03^2+(1/3)^2*0.05^2+（1/3）^2*0.03^2+2*(1/3)^2*0.5*0.03*0.05+2*(1/3)^2*0.2*0.03*0.03+2*(1/3)^2*0*0.05*0.03 =
    e(-4*1)
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×0.33-2×40×0.58
    (20+19.4×1.7+19.2×3.1+19.8×3+20×2.5)×0.52-2×40×0.72
    (20+19.4×1.7+19.2×3.10+19.8×3×0.61-2×54.0×0.87
    (20+19.4×1.7+19.2×3.10)×0.61-2×54.0×0.87
    (20+19.4×1.7+19.2×3.10+19.8×1.5)×0.61-2×54.0×0.87
    (20+19.4×1.7+19.2×3.10)×0.61-2×31×0.87
    (20+19.2×1.7 )×0.61-2×42.4×0.78
    (20+19.4×1.70)×0.6-2×42.4×0.77
    20× 0.6-2×42.4×0.78
    sqrt(10^7)
    50*25−7620*5+9876.6
    89^0.4
    89^2/5
    4.32*(1+0.04)/(0.17-0.04)
    4.14*(1+8%)/(1+14%)+4.14*((1+8%)^2)/((1+14%)^2)+4.14*((1+8%)^2)*(1+2.9%)/(14%-2.9%)/((1+14%)^2)
    e^0.59
    9/14÷7

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