2/3x+1大于x减2/3
    -7(x+2)+2（3x+4)>-4
    3x+6>x+4
    8x-2-2x-5>-28
     8 * x - 2 - 2 * x - 5 > -28
    8x-2-2x-5>-27
    2x-2>3x-4
     0.1*X >0.231*(0.1+X)^2
    0.2*X>0.231*( 0.2+X) ^ 2
    0.1X >0.231*(0.1+X)^2
    0.1X>2.31*(0.1+X)^2
    2.31X^2-0.538X+0.0231<0
    1+x＞-1
    1000(x/10)*50>=34000
    1000(x/10)>=34000
    1000((x/10)*50-40)>=34000
    4*((5000-x)/150)
    10000-50a<75a<75(200-a)
    (-16x/(4xx+25)+56x/(49xx+36))^2+(2+(16xx/60)/(4xx+25)+(196xx+96)/(49xx+36))^2-2(10+(80xx+300)/(4xx+25)+(980xx+480)/(49xx+36))＜0
    a+2a+2>30-a-2a-2 30-a-2a-2+a>2a+2 30-a-2a-2+2a+2>a

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