50x+35（600－x）≥26400
    3／5x＞4／x-3-2
    -2x-4<0
    1/3 <= (x-1)/x < 1
    1/3 <= (x-1)/x
    -50-（100+X）×1%+X≥10
    (100+X）×1%+X≥10
    (2x-1)/3-(5x+1)/2<=1 5x-2<3(x+2) 3x>=4x-1 (5x-1)/2>x-2 x+2(1-2x)>=-4 (3+5x)/2>x-1 2x+4<=5(x+2) x-1<2/3x
    x-(6.86*2+2+4.5+0.6+0.05*x+0.1*x)>0
    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

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