1/8x<=1
    （4500×12×0.9-60%×70X×6.95%）÷(40%×70X+5%×70X)=3.8%
    x^2-4>0 2x^2+x-6>0
    x^2-4>0
    2x^2-x-1<=1
    [-2(k+2)]^2-4(k^2-2k-2)≥0
    (x+1)*(2x-1)<=1
    2x^2+x-1=0
    x+【0.2*（x-0.3）】/（x-0.4）-0.3 >0.6
    x-【0.2*（x-0.3）】/（x-0.4）-0.3>0.6
    (2x+1)/(x-2)>=1
    x(x－4) >0
    -2{x}^{2}+x-6＜0
    (2m-1)^2-4*1*(2m^2-1)
    (9000-0.466*x)/(49.5*x)=0.038
    sqrt(3*x+5)>x-2
    （a-1）^2<4
    2（x+1）(x+1)<7
    5/18v+1/125v2－15=0
    2/a >(-a+sqrt(a^2+9))/2

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