（1/2）x>(1/3)x
    3-x-2/2>x/3+1
    3-x<-1
    2x-1>4x+13
    2x-5>0
    (x-1)^150*(x-1000)^140>x^150*(x-1001)^140
    C(7,x)×3^x×2^(7-x)>C(7,x+1)×3^(x+1)×2^(6-x)
    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

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