-5x<25
    -(1/2)x>(3/2)x-1
    150×a+100×（12-a）≥1500
    -2x>-1
    5000×a+3000×（12-a）<54000
    70x+90×（2x+5）≤5450
    7x-3>6x-16
    30x+50(6-x)+(10-x)40+80(2+x)<900
    x^3-2*x^2-x+1>0
    0.9%<（135.6-X）/（125.6-X）<1%
    x+2≥1
    10x+4-3<3x-18
    1/(n+1)^4<10^-12
    W^4-44.5*W^2+20.2>0
    2*W^4-89*W^2+20.1<0
    -3494.8407478+53.473*n+967.3884*n*n/6+30.4512*n*n*n/6>0
    -3268.9510864-1.3682*n+940.6236*n*n/6+30.4512*n*n*n/6>0
    （90-a）×150≧3750
    4x-x^-1>0
    2((5a-1)/2-5)>=8a

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