√242
    √0.0422
    √0.0067
    1/3*(7.29%+0.09%+5.29%)
    1/3*(1%+0+1%)
    （17%-40%)^2
    （17%-20%)^2
    （17%+10%）^2
    （15%-25%）^2
    （15%-5%）^2
    1/3*40%+1/3*20%+1/3*(-10%)
    1/3*25%+1/3*15%+1/3*5%
     (253.02e + 23.41e^2)*(759.06 + 46.82e/1518.12 + 140.46e*e)
    0.5*3.375/1.2^0.5+1*3.375/1.2^1+1.5*103.375/1.2^1.5
    0.5*10/1.08488^0.5+10/1.08488^1+1.5*110/1.08588^1.5
     0.5*10/1.1^0.5+10/1.1^1+1.5*110/1.1^1.5
     (1-e(-0.142))
     (1-e(0.113))
    (0.368407-0.2)*800
    arctan114

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