X/77645.27<2
    3X^2-26X-9=0X>=0,X=
    3x^2+4x-5<0
    5x>8+2x
    2-x>=0 2x>x-1
    4*x*x*x+3*x*x<=1
    13x＜7
    13x＜7
    59x+(80-x)66≦4900
    59x+(90-x)66≦4900
    120z+400*180>=81600
    (788*1.2+1200)*4.5*1.4*1.55/3*3*x<(671*1.16+1200)/0.85*5*1.44
    (788*1.2+1200)*4.5*1.4*1.55/3*x<(671*1.16+1200)/0.85*5*1.44
    (788*1.2+1200)*4.5*1.4*1.55/3*x<(671*1.16+1200)*15/0.85*5*1.44
    -x+1/ex＜ln1/x+1/x
    ex-x>x-lnx
    (788*1.2+1200)*4.5*1.4*1.55*45/3<(671*1.16+1200-x)*15/0.85*5*1.44
    (788*1.2+1200)*4.5*1.4*1.55*45/3*0.2<(671*1.16+1200-x)*15/0.85*5*1.44
    (1+x)/(1-x)<=1.5
    (788*1.2+1200)*4.5*1.4*1.55*45/3>(671*1.16+1200-x)*15/0.85*5*1.44

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