-5.4365598×10^(-11)×〖425.712〗^4+1.9227014×10^(-7)×〖425.712〗^3-1.1415×10^(-4)×〖425.712〗^2+1.0267×425.712
    (-5.4365598×10^(-11) )×297^4+1.9227014×10^(-7)×297^3+(-1.1415×10^(-4)×297^2)+1.0267×297
    4375×［1+1%]×［1+2%］
    0.5/1
    2/1/1
    0.378*3600*0.675*e^(-6*0.675)/0.13199
    0.378*3600*0.675*e^(-6*0.675)/(1-e-3*0.675)
    0.378*3600*0.675*e^(-6*0.675)/[1-e^(-3*0.675)]
    (19799.78+3500+43938.64)/ 46354
    -300+(23.75-67.5)/1.1+(23.75-75)/1.1^2+(57.5-112.5)/1.1^3
    -300+（23.75-67.5）/1.1+（133.75-75）/1.1^2
    300-（（300*0.95）/3*2）
    -300+225/1.1-67.5/1.1
    300-（300*0.95）/3
    299646/(0.7×8×1568)
    3+3
    293000/(0.7×16×1208)
    293000/(0.7×16×2604)
    6×302+468+324
    √(〖785.9〗^2+〖12.3〗^2 )/2

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