4x^2-4x-15>0
    -2x^2+12x-18>=0
    6+x-2x^2<1
    6+x+2x^2<1
    -3x^2+5x-4>0
    4x^2-13<0
    -2x^2+30x-110≥0
    35x+25(50-x)>=1530 15x+35(50-x)>=1150
    35x+25(50-x)>=1530
    494x^2+19756x-234764>=0
    91x^2+6x-4<0
     (x^2-4x-5)/(3x^2-10x+8) ≥0
    24x+20(5000-x)≤112000
    0.6^n>=0.99
    1-0.4^n>=0.99
    x-1小于等于2-x
    550x＋（700-55x）÷45×495≤7370
    abs（x+1）-abs（x-2）≥0
    x∧2-e∧x≥0
    1-x>=0

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