x*x-x<-1/144
    x*x-x<-1/64
    x*x-x<-1/8
    x*x-x<-1/16
    (20-x)*0.4+(30+2x)*0.25<=16
    4000*(20-y)-2500*(30+2y) < 160000
    4000*(20-y)-2500*(30+2y) <= 160000
    4000*(20-y)-2500*(30+2y)<=160000
    2*x*（100+x)<1
    2*x*（100-x)<1
    x*4 > 35
    X*0.9>1.15
    1.35*（0.9-X）>1.15
    10x(1+0.01x)＞10000
    8x(1+0.01x)＞10000
    5x(1+0.01x)＞10000
    5（x-1) >(3+1.1)(x-1)+1.65+3+2.05
    5（x-1) >(3+1.1)(x-1)+1.65+3+2.2
    5（x-1) >(3+1.1)(x-1)+1.65+3+(3+1.1)/2
    5（x-1) >(3+1.1)x+1.65+3

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