(500/9.09)^2>(50+1/270/x/x)^2+(1/x)^2
    1+x/1-x ≤2
    24*12-（12-2x）*4x/2
    1.79X+1.91(1-x)<2
    1.81X+1.85(1-2)<2
    26700 + W * ( 1 - 10 % ) / 4 ≥50000
    1.86X+1.94(1-x)<2
    x^(x-31)-(x-31)^x=31
    0.6x+90+60=1.4×(0.4x+90+60)
    xcosx＞-1/3 x＞-2 x＜0
    xcosxcosx＞-1/3
    xcosx＜-1/3
    1.5x-x=5
    12+x＞23
    50x^2+4.7x-2000>0
    1+e^2
    3.5x-1x＜21
    41.6（x^3/2-x^2/3）<25000
    x+5＞3+6x
    （x-6）＋（x－4）＝x-1

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