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
    not＞1
    2≤elg(log+1)＜5
    A*asinA＞5
    AAsinA＞5
    lgcoslog＜-1
    tan(log(sinlog,coslog)＞20
    A(log,log)＞20

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