x^2*ln(0.8*1.944/x/1.695)/(1-x)^2/ln(0.2*1.944/(1-x)/6.193)=1
    x^2*ln(0.8*1.944/x/1.695)/(1-x)^2/ln(0.6*1.944/(1-x)/6.193)=1
    lnx＝1/x
    0.95x+7.2-1.0375x=0
    （3.5+x）×7.97=12.13x
    （9+2x）×（40+2x）×72%=90×40
    （1.005）^12t=e^((t^2)12）
    ((sqrt(5)-1)/2)^15=x
    x ^3 －3 x ^2 + 14 x －24
    X=12323324X
    X=X
    （30-x）（80+4x）＝2496
    （30-x）（80+4x）
    7=-5.176/0.000137^2ln[1-1.595*0.000137x/5.176(1.595-0.000137)]-x/0.000137
    6=-5.176/0.000137^2ln[1-1.595*0.000137x/5.176(1.595-0.000137)]-x/0.000137
    5=-5.176/0.000137^2ln[1-1.595*0.000137x/5.176(1.595-0.000137)]-x/0.000137
    5/4X^2+1/5X-24/25=0
    (160＋x)(50-0.1x)=9450
    5/4XX+1/5X-24/25=0
    5/4X+1/5X-24/25=0

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