{5x - 2>3(x+1) {(1/2)x - 1 <= 7-(3/2)x
    5x - 2>3(x+1) (1/2)x - 1 <= 7-(3/2)x
    1/x-2>0
    5x - 2>3(x+1)
    （1+2x）/4 + 1/5 >(1-3x)/10
    -7x^2＋22x-15≥0
    x*1/2（20-x）>=42
    -4x^2＋8x＋4≥0
    (a+4)^2-16a>0
    （k-1）(k+31)>0
    (x-1)(x-2)(x-3)>1
    (x-1)(x-2)(x-3)>0
    (x-1)(x-2)(x+3)>0
    (x-1)(x-2)>0
    sin(x)>sin(80)
    －8x＾2＋57x－49≥5000
    －8x＾2＋57x－49≥48
    -11200+X-X*0.1*3/12≥100
    -11200+X-X*0.1*3/12>100
    -11200+X-X*0.1*3/12≧100

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