x^2-5x-10≤0
    x^2+3x-2≤0
    -x^2-3x+2≤0
    -2（x-50）(x-50)+800≥750
    -408.275+300+X-X*0.025-45≥30
    X^2+9 x- 400≤0
    abs(x+2)+abs(x-5)≥9
    x2+x+4=>0
    -t（5t+4）＞0
    x^2-x+1＞0
    1/2x+3/2*（x-2）≥1
    x-1+9≤-3x+6
    x-1+6≤-3x+6
    (x-1)/3+3≤-x+2
    （x-1）/3+3≤-x+2
    x-3（x-1）≥5
    x-（x-1）≥5
    0.5M+1.2（36-0.5M）≤40
    4y+1.5(10-y)>33
    2(x－5)(x+3)＞2x+1

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