(3x+2)/4=8
    2x^2+2x+1＝0
    2-2√6＝5x^2-2x
    100*x*222.64/(x*222.64+(1-x)*0.5*335.17)=93.690
    4.8594=（（28.02*0.639（x+0.1））/（1+0.639（x+0.1））*（（100-6.66-1.14）/100）*（1/(1+0.31*1.14）+（（0.76（x+0.1））/（1.3*0.101325））
    0.87X=350
    （2+h）^2
    x^3-15x^2+48x+40=0
    12964.5=(260*63-x)*0.95
    （310*x*x-1.107*2*x）*3.1415926/4=0.06
    （310*x*x-1.107*2*x）*3.1415/4=0.06
    (1+X)^7×(1+X-0.0012)^12×(1+X-0.0008)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.0018)^12×(1+X-0.0016)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.0022)^12×(1+X-0.0016)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X)^12×(1+X)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.09)^12×(1+X-0.15)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+X-0.2)^12×(1+X-0.5)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+0.17%)^12×(1+0.11%)^12×(1+0.25%)^12=1.1349
    (1+X)^7×(1+0.16%)^12×(1+0.11%)^12×(1+0.25%)^12=1.074
    (1+X)^7×(1+0.17%)^12×(1+0.11%)^12×(1+0.25%)^12=1.074

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