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
    x-3（x-1）≤7
    ((0.2*k+(0.2/3.1416)^2-0.1)*(0.2*k+0.9)-(0.2/3.1415)^2 *(0.2*k+1))/(0.2*k+(0.2/3.1416)^2-0.1)>0
    6x＋5>4x 18－7x<10－3x

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