(160＋x)(50-0.1x)=9450
    5/4XX+1/5X-24/25=0
    5/4X+1/5X-24/25=0
    23-（Y/3-3）=Y
    1/x-1/x^3
    (x+1)sinx
    [3150000*y]+15012.33/[(1+y)^360]=15012.33
    [3150000*y]+[15012.33/(1+y)^360]=15012.33
    3150000*y+15012.33/(1+y)^360=15012.33
    [3150000*y*(1+y)^360]/[(1+y)^360-1]=15012.33
    19*0.9x/88=(80-x)*0.78/84
    [3150000*(y^361)]:[(1+y)^360-1]=15012.33
    (3150000*y^361):[(1+y)^360-1]=15012.33
    X=（10000+2000）*5/4
    （10+x）（80-2x）=1200
    （40-30+x）（80+2x）=1200
    （10+x）（80+2x）=1200
    X-X*0.065-(X+671559.63)*0.0003=671559.63
    X-X*0.065-(X+671,559.63)*0.0003=671,559.63
    ln((1-x)/(1+x))

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