（0.0167+0.2×0.0228）×6.42×3.25×3.35+（0.0366+0.2×0.0396）×1.88×3.25×3.35
    （0.0228+0.2×0.0167）×6.42×3.25×3.35+（0.0396+0.2×0.0366）×1.88×3.25×3.35
    193.191×[1.88-(5.6-2.8-0.6]
    193.191×1.88-193.191*[(5.6-0.6-(-0.651 )]
    193.191×1.88-193.191[(5.6-0.6-(-0.651)]
    1/3×[5.6-0.6-(-0.651)]
    (42-6.2*0.57)(5.6+0.57)=
    (42-6.2*0.57)(5.6-0.57)=
    1/3×[5.6-0.57-(-0.651)]
    1.1×1.25×109.24×1.8=
    (360×6842)/(14.3×635850)=
    arccos(1)
    e^(0.03*2)*(1089396-5^e(-0.03))
    e^(0.03)*1089396
    0.05*e^(-0.03)+0.05*e^(-0.03*2)+0.05*e^(-0.03*3)+0.05*e^(-0.03*4)+1.05*e^(-0.03*5)
    0.046+2*0.045+3*0.043+4*0.041+5*0.825
    0.05*e^(-0.031)+0.05*e^(-0.033*2)+0.05*e^(-0.035*3)+0.05*e^(-0.037*4)+1.05*e^(-0.039*5)
    600*0.95
    500*0.95
    500*0.12

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