-2.355+5.174-7.256=
    -1.032+3.563-4.886=
    -0.282+2.203-2.953=
    2700/(45*5)
    18*5*30
    496/(10*8)
    560-64
    9*5 7*4 23-6 34-3221 4+21
    10*8*7
    8.314×1623.15×(0.3×ln0.3-(0.3-0.01)×ln(0.3-0.01)-(1+0.01)×ln(1+0.01))-0.01×92441.7-0.01×31575.3+0.01×140112
    8.314×1623.15×(0.4×ln0.4-(0.4-0.01)×ln(0.4-0.01)-(1+0.01)×ln(1+0.01))-0.01×92441.7-0.01×31575.3+0.01×140112
    8.314×1623.15×[0.5×ln0.5-(0.5-0.01)×ln(0.5-0.01)-(1+0.01)×ln(1+0.01)]-0.01×92441.7-0.01×31575.3+0.01×140112
    10*((1.25*0.103)^2+1)^(0.5)/((1.25*0.2)^2+1)^(0.5)/((1.25*0.5)^2+1)^(0.5)/((1.25)^2+1)^(0.5)/1.25
    10*((1.25*0.103)^2+1)^0.5/((1.25*0.2)^2+1)^0.5/((1.25*0.5)^2+1)^0.5/((1.25)^2+1)^0.5/1.25
    0.103*9.71
    10/1.03
    （9.6+(12-9.6)/(100000-50000)*(86155.45-50000)）*1.0*0.9
    （19.6*7.1+20*6.8）/13.9
    （18.1*0.8+18.4*3.7+18.3*7.3+19.6*7.4+20*6.8）/26
    （44+（44-29.6）/（100000-50000）*（86155.45-50000））*1.0*0.9

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