X×2.95＝166.536-x
    X×2.75＝166.536-x
    X×2.55＝166.536-x
    X×2.35＝166.536-x
    X×2.15＝166.536-x
    X×1.95＝166.536-x
    1.75×10^-6-1.75×10^-5x=x^2
    -x²+x
    x+5√（4-x）+8=0
    x+5√4-x+8=0
    224*(1-r^11)/(1-r)-224=1736.72
    (10-y^2)^2/y^2+y^2=25
    x+6＝1.5x
    5/6x0.2-x=1/12
    2/3x+50%x=210
    54*x+2/3*x+0.5x+11/12*x+5/12*x+5/6*x=124180
    396000*731=14.3*300*186*（360-186*0.5）+360*x*320
    2x^2-5x=0
    3q^{2}+24q-60=0
    0.2q^{2}+4q-10=0

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