(2x+6)/5<[(x+1)/2]+1
    x(x-2)<0
    x(x-3)<0
    1.8x+74>0.45x+66
    1.8x+74<0.45x+66
    1.8x+74>0.45x+66
    √(2x-3)+√(3x-5)>√(5x-6)
    50c+40（50-c）≤1820
    x+6≧4x
    2（x+1）＞x-1
    2（x+1）＞x-1 x+6≧4x
    18a+14（a+3）≥2250
    x * x <= 289
    xx<=189
    10x-5（20-x）≥100
    xxx>0.5
    70+9a≥300
    -x＞-3
    -x＞11
    sinlog*sinlog-sinsinlog＞0

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