（4500×12×0.9-60%×70X×6.95%）÷（40%×70X+50%×70X）=3.8%
    2x（2x）=5
    a-6<6
    sinx/x>1/2
    1
    (x+1)/2-(x-1)/3>1
    1+2x>-1
    x^5-5*x^4-x^3+29*x^2+9*x-29=0
    x-1<0<3-x
    3-x
    0<3-x
    50-x>x
    4x^2-44x+132>
    X*(6x+5)<4
    -13*a^2+98*a-120>0
    468*a-12*a*a=1296
    x+sqrt（x^2+1）>0
    x+sqrt（x^2+x）>0
    26700+X-X*10%/4 ≥50000
    4x^2+5x+2=0

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