75+20.4X/500+34X>0.3
    70+20.4X÷500+34X>0.3
    (n+1)/(2*n)<1011/2020
    （x+1)/2-(5+x)/6>3-(x-1)/3
    -8(2x^1/2lnx+x^1/2)lnx-(-8x^1/2lnx)^1/2>0
    -2(1+x)^1/2+(-8x^1/2lnx)>=0
    4x+4+8x^1/2lnx<0
    -16x<36
    4x>-32
    x(60-x)>900
    x^3-2x^2-5x+6<0
    (x+3)(x+2)(x-5)>=0
    (x+1)(-2x+3)(3x+1)>0
    (1-2x)(x-1)(x+2)<0
    3x^2－5x+1≥0
    2x^2－2x+1<0
    －5x^2+7x+6<0
    x2>5
    abs（2x-2）+abs（x-6）≤10
    1/2x-1≤7+3/2x

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