0.5*4.67+4/6*5.99
    12500*12-60000-2500*12-500*12-2000*12
    3/4*4.67+3/2*5.99
    3/4*4.67
    160-9/8*5.99
    [20%*(50%-18%)^3+30%*(25%-18%)^3+30%*(15%-18%)^3+20%*(-20%-18%)^3]/(0.226053) ^3=
    [20%*(50%-18%)^3+30%*(25%-18%)^3+30%*(15%-18%)^3+20%*(-20%-18%)^3/(0.226053) ^3=
    [20%*(10%-17.5%)^3+30%*(15%-17.5%)^3+30%*(20%-17.5%) ^3+20%*(25%-17.5%) ^3]/( 0.051245) ^3=
    arcsin(135/684)
    arcsin(0.19737)
    1/1.1+1/1.21+1/1.331
    4^(1/2)+4
    =((1/8000)^(1/2))*(1/0.03)*(1/2)^(1/12)
    ((1/8000)^(1/2))*(1/0.03)*(1/2)^(1/12)
    2*（4^(1/2)）
    4^(1/2)
    (18%-5%)/0.226053=
    sqrt(0.2*(0.5-0.18)^2+0.3*(0.25-0.18)^2+0.3*(0.15-0.18)^2+0.2*((-0.2)-0.18)^2)=
    sqrt(0.2*(0.5-0.175)^2+0.3*(0.25-0.18)^2+0.3*(0.15-0.18)^2+0.2*((-0.2)-0.18)^2)=
    sqrt(0.2*(0.5-0.175)^2+0.3*(0.25-0.18)^2+0.3*(0.15-10.18)^2+0.2*((-0.2)-0.18)^2)=

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