-18.34+1.498x+0.001377（x^2）=692.86
    -18.34+1.498x+0.001377x2=692.86
    X-（X-X/1.064*0.064）*0.2=61074.39
    1-(1+a)^-5=a*3.181
    0.1-0.1X=X
    0.25w^6+1.25w^4+w^2=255
    X-X*0.065-X*0.0003=169541.29
    sinx
    x*x*x/2*（1+x）*（1+x）
    R^2-45R+324=0
    （12500-x）/[（-89/31）x]
    0.4374497/(5.99-x)+1.037088/(2.34-x)+0.4463/(1-x)+0.0160648/(0.43-x)=0.1
    X^3-5X^2+6X-1=0
    sinπx/2
    0.3x^2-4x+15＝0
    0.3x^2+4x+15＝0
    X=80140-(480+17.8%)
    X=71198-(480+17.8%)
    X=86102-(480+17.8%)
    sqrt(2)*x/2+sqrt(2)*x/(4+2*sqrt(3))=30*sqrt(3)

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