20xxxx-24xxx+36xx-36x+9=0
    x^4+16x^3+95x^2-16x-64=0
    6x^2-5x+1<0
    （70%-15%）-（1+10%）/10%*8%*（1-x）=0
    x^2=(8-x)^2+(20-80/x)^2
    x^4-24x^3-168x^2-100x+400=0
    3x^3-4x^2=0
    3000+750/P=3350+400P
    x4-24x3-168x2-100x+400=0
    x^2-2/3x+1=0
    144x^2-726x+909=0
    (3k)^0.6=4
    x-0.06x＝10000
    3x+1<2x-5
    1-100*x+0.5*(100^2)*(x^2)-(100^3)*(x^3)/6+(100^4)*(x^4)/24=0
    1-100*x+0.5*(100^2)*(x^2)-100^3*x^3/6+100^4*x^4/24=0
    1-100*x=0
    -48+13.2*(x^8-1）/(x^8*(x-1))+0.15/x^8=0
    （1-q^6）/（1-q^2）=21/16
    t^3-21t+5=0

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