x^3-2x^2+x-1<0
    (5x-1)÷2>x-2
    3x≥4x-1
    x+2(1-2x)≥-4
    x+1≤5 7-4x<1
    2x-1/x+3≥0
    (2x-1/x+3)>1
    1936/x*0.8=1936/x+88
    x-2x^-1-1<0
    x-2x^-1-1>0
    1+x/2 - 2x-1≤1
    1.637*x^(1/2)+9.9*x<=1005
    1.637*x^(1/2)+9.9*x>=1000
    (1+2d)^(2)=(1+d)×(1+5d)
    (1+2d)^(2)=
    -x^(2)＋x<-2
    （x^(2)-4x+1）÷x>0
    1.2x<3 (x+1)÷2≤2
    1.2x<3 (x+1)≤2
    2x+4>3x

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