1/(x+1)<1
    1/（x+1）>0
    a^4-6a^2+9-32>0
    10000(1-e(-60/(10001*x)))>0.99*60*x
    -3<=(2*x-1)<=3
    -1<=(2*x-3)/3<=1
    3/4*n+(-1)^n<=3/2*n
    （x-9）（x+1）≤-9
    x<-1 x>4 x>5
    (x-2)/3+1<=(x-1)/2
    x-2/3+1<=x-1/2
    x^2-3x-4>0
    abs(3x-1)<5
    abs(3x-5)<5
    x^2+5x-6<=0
    -1<(1-x)(2*x^2-5*x+1)<1
    4x^2+7x-36>0
    （x+310)*2*0.63+（x+310)*0.37>（x+650)*2*0.33+（x+650)*0.67
    5x-2<=3x+1
    x/3+1<3x-7

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