1.35×(1.0+1.0×1.2×1+1.0×1.2×0.6×26)+1.4×(3+3+2)×1.0×1.2
    (0.677×30.28×1200^4)/(100×（2.06×10^5）×1.98×10^6 )
    (30.28×1200)/(2×1274)
    4360320/(3.97×10^4 )
    (30.28×1200^2)/10
     (2/3)*30
    39.362/38.735-1
    (0.25-0.01)*0.15^2+(0.12-0.01)*0.3^2-(0.25+0.12-2*0.01)*[0.15*0.3*(-1)]
    (0.25-0.01)*0.15^2-(0.12-0.01)*[0.15*0.3*(-1)]
    (0.25-0.01)*0.15^2+(0.12-0.01)*0.3^2-(0.25+0.12-2*0.01)*[0.3*0.15*(-1)]
    (0.25-0.01)*0.15^2+(0.12-0.01)*0.3^2-(0.3+0.15-2*0.01)*(0.3*0.15*-1)
    (0.25-0.01)*0.15^2-(0.12-0.01)*(0.3*0.15*-1)
    0.15/(0.15+0.3)
    81^2
    81^31
    85*2.5
    10^0.4
    4.4^3
    6.3/（1.1*1.3）
    6*0.82/0.059

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