-2x+2<0
    4x^2+4x-8≥0
    x^2+8x≥0
    x÷（x-1）≥0
    2x^2-5x-3≥0
    0.915164x^3 -260.764x^2+24614.8x-768549>0
    x^2-8x-20＜0
    x^2-4x＜0
    x^2-x＜0
    x^2-3x+7＜0
    x^2+4x＜0
    （x-2）^2（x^2-3x+2）≥0
    3-a<4-2a
    x+3>15
    x+3>7
    xx+5x+9>3
    60-a>=38 135a+180(60-a)<=9900
    60-a>=38
    26700+A-A×10%/4≥50000
    -12500-50000*12%/12+X*12%/12>5000

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