2（x+1）+3<3x x-2/3+4>x
    13+x>1/3(45+x)
    1/3*x+25<=22
    2x+0.25<6+0.25
    13-5x>-7x+9
    4-6x<-x-1
    -9x<-3x-24
    8-x>-3x
    12-2x>3x-8
    23-x<5x+5
    21-2x<7
    6-7x<20
    2x^-5x-3<0
    －15000+X-X×8%/4≥4500
    2.8*e^0.008t-0.03t>4.9
    (x-1)÷2≥2x-4
    3（x-1）<5x+1
    2x-1+x÷2<1
    2x+5≤3（x+2）
    3xe^(-x)<1

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