1+x2大于或等于0
    6-2x≤x^2-3x<18
    6-2x≤x^2<18
    x(x+2)>0 x^2<1
    x^2-4<0
    6x^(2)<2lnx
    6x-2lnx/x>0
    10y+5y ≤1500
    10y+7.5y ≤1500
    3x+3>0 x-6<=0
    2x+1<=0
    x^2-5x+6=0
    x^2+5x+6=0
    sqrt(x^2-8*x)>2*x-1
    100z+60×2z≥110000
    1÷(x-3)÷(x+1)≥1÷(x+1)÷(3x-4)
    1÷(x-3)÷(x+1)≥1÷(x+1)(3x-4)
    abs(6-3x)≥3
    abs(2x-4)≤8
    -abs(4-2x)≥8

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