-40+x-20*12%/4-x*12%/4≥30
    -40*x-20*12%/4-x*12%/4≥30
    -40*x-20*12%/4-x*12%/4≥30
    0 <1-1/x^2 <=4
    xx-6x<-8
    (1 + 3x)^(-4)-1+12x>-0.1
    (1 + 3x)^(-4)-1+12x<0.1
    x^2/1<0.0025
    e^a+e^(-a)≥-2 e^a+e^(-a)=0 e^a+e^(-a)=(√5-1)÷2 cos(a)≥-1 2cos(a)=e+1÷e
    e^a+e^(-a)≥-2
    （1+5x）^(-4)-0.1<1-20x<（1+5x）^(-4)+0.1
    3x-5x^2/（10x-3）＞0
    3x-5x^2/（10x-3）＜2/5
    x^2-2x≤4x/x+1
    -11x²+30x+9＞0
    3x²+2x-1＞0
    3x²-13x+16≤0
    x²+10≥6x+1
    4x²≤x²+1
    5x²-x-6＜0

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