80*x^2-3x+260≥0
    (100-10x)*(100+16x)≥10260
    (100-10x)*(100+16x)≥8000+1280x
     (3322.08*((1-1/(1+i)^20)/i)-905/32*((1-1/(1+i)^32)/i))*(1+i)^32 > 100000
    x-abs（x-1）＜ =3
    x-abs（x-1）＜=3
    -x*x+4*x-3<0
    (-m+3)^2-4*1*(-m)>0
    2x^2+3x-1=0
    2*x^2-6*x=x^2-5
    6x^2+5x+1>0
    6x^2+5x+1=0
    (x-1)(3x-2)>2x*x÷2
    (x-1)(3x-2)>2x^2/2
    1-3x<2-2x<3-x
    20-3(5x+6)<0.5(14-22x)
    20-3(5x-6)<0.5(14-22x)
    6x-7>18+11x
    n^200>3^300
    200+（x+2）=150x×2

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