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    x×x-3x+4
    x²—3x+4
    (32%x-24)除以(x-40)=25%
    x+0.1x=1200
    3m²+4m=0
    1.57*1.1*2.06*x=4.39
    3m²+4m=0
    ((6*t+4*sqrt(21-3*t))/14-t/3-4/3)^2+((-8*t+4*sqrt(21-3*t))/14+2*t/3-4/3)^2=((6*t-4*sqrt(21-3*t))/14+t-4)^2+((-8*t-4*sqrt(21-3*t))/14+2*t-4)^2
    323*t^2-1994*t+(330t+168)*sqrt(21-3t)+3020=0
    x-0.08x=172.96
    720*x+830*(1-x)=784
    [1500/(1+r)]+[1500/(1+r)^2]+[1500/(1+r)^3]+[1500/(1+r)^4]+[1500/(1+r)^5]+[1500/(1+r)^6]=7200
    20X-5X²-3=0
    131000=x+x/11.3+3840+950+500+350
    131000=x+x/11.3+950+350+500
    1.77*1.1*2*x=4.52
    x+x/11.3=129000
    (42.309+x)×1.95=75.418-x+42.309
    (42.309+x)×1.95=76.418-x+42.309
    -2x^2-4x=-1

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