e*x-1/（x+2）>0
    (5x+3)(5-2x)<=0
    19x-10x^2+5<=0
    -10x2+19x+5 <= 0
    -10(x^2)+19x+5 <= 0
    -10x^2+19x+5<0
    -10x^2 + 19x +5 < 0
    -10x^2 + 19x +5 <= 0
    x<(-50/-20)
    （5x+3）(5-2x)<=0
    (5x-2)/(x+5)＞6
    （X-1）^150*(X-1000)^140>X^150*(X-1001)^140
    (10-x)(11-x)>6
    8x^2-21x+104>0
    8x^2-21x+104＜0
    310x+50(460-x)<18000
    964.18+587.31x+(242.88x+17.5x^2)×(242.88x+11.66x^2)/(485.76+34.99x)-(241.32x+7.74x^2)×(201.1x+4.30x^2)/(402.2+12.89x)≥0
    （x-1）（x-2）＜0
    x+3>=3(x-2)
    x+4>=3(x-2)

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