√0.4*(2%-3.4%)^2+0.4*(3%-3.4%)^2+0.2*(5%-3.4%)^2=
    √0.4*(-25%+2.8%)^2+0.4*(3%+2.8%)^2+0.2*(30%+2.8%)^2=
    (400*23.08-6000)/(400*23.08)=
    (400*23.08-6000)/400*23.08=
    064*（-0.25）+064*0.03+0.2*0.3=
    (10*200-40*200-3000*10%)/5000=
    0.154+1.5362*(-0.236) 0.154+1.5362*(-0.243) 0.154+1.5362*(-0.250) 0.154+1.5362*(-0.256) 0.154+1.5362*(-0.261) 0.154+1.5362*(-0.266) 0.154+1.5362*(-0.271)
    0.154+1.5362*(-0.08)
    0.154+1.5362*(0.743)
    0.154+1.5362*(0.702)
    0.154+1.5362*(0.629)
    0.154+1.5362*(0.552)
    0.154+1.5362*(0.478)
    0.154+1.5362*(0.390)
    0.154+1.5362*(0.286)
    0.154+1.5362*(0.122)
    0.154+1.5362*(-0.496)
    0.154+1.5362*(-0.481)
    0.154+1.5362*(-0.458)
    0.154+1.5362*(-0.441)

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