x+1≥0 2x-1≥0
    x/-5+1-4x/5+1>5
    -50x≤-200
    -5x≤-200
    [0.16+0.4(1/sin x-1)]<28
    12-2x<2x
    5/3x-3x<=-10
    5/3x<=3x-10
    -2-x大于等于-3
    x-1/7<2x+5/3
    (x+3)/5>2x+3 (x+3)/5>1-x
    -3(x-2)>=4-x (1+2x)/3>x-1
    -3/k＞2
    -3/k＞-2
    3X-2≥x
    x-4<4X+2
    R*5.1*（4.7+100）/（R+5.1）<1/(2*π*100)
    -(7*k+2)-sqrt((2+7*k)^2-4+28*k)<0
    -(7*k+2)+sqrt((2+7*k)^2-4+28*k)<0
    -(5*k+6)+sqrt((6+5*k)^2-36+20k)<0

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