（（20%）^2*(20%)^2*5+5*2*20%*20%*0.01）^0.5
    90/(1+6%)+90/(1+6%)^2+90/(1+6%)^3+90/(1+6%)^4+90/(1+6%)^5+1000/(1+6%)^5
    （20%）^2*(50%)^2+（20%）^2*(50%)^2+2*50%*50%*0.01
    0.04*0.898^2+0.625*(1-0.898)^2+2*0.898*(1-0.898)*(-0.036)
    957920.74638*1.01
    957920.74638*0.01
    64500*14.85148444
    0.09*(1/3)^2+0.04*(1/3)^2+0.625*(1/3)^2+2*(1/3)*(1/3)*0.125+2*(1/3)* (1/3)*0.144+2*(1/3)* (1/3)*(-0.036)
    10lg(37)
    0.09*0.2^2+0.04*0.5^2+0.625*0.3^2+2*0.2*0.5*0.125+2*0.2*0.3*0.144+2*0.5*0.3*(-0.036)
    10lg(60)=
    15%*0.2+10%*0.5+20%*0.3
    0.09*0.4^2+0.04*0.6^2+2*0.4*0.6*0.125
    0.09*0.4^2+0.04*0.6^2=
    0.09*0.4^2+004*0.6^2
    8＾（2/3）+1
    8＾2/3+1
    15%*0.4+10%*0.6
    75+0.5*298+25*7
    75+0.5*298+25*6

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