-3x<-15
    19-x<2
    10-x>0
    0.55*60+0.5x＞55
    100+x /240-x/280≥0.6
    (100+x /280-40)-x/280≥0.6
    sqrt(0.07051/1.44*(10^-7)*(H)^0.25)≤H
    （0.07051/1.44*(10^-7)*(H)^0.25≤H
    loga>2
    （1180+a）（200a－980）∧2/380（800+a）（180+a）1000＜2.706
    4x+5＜13
    -20<-3/2x+1<16
    -（x-1）+10<-3(x-3)
    （x-1）/7＜（2x+5）/3
    ex＜x
    11x>=619
    4.5x+1.2x+2x+3.3x>=699
    4x>=599
    11.5x>=799
    t + 23 < 123

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