(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
    (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<(671*1.16+1200-x)*15/0.85*5*1.44
    4x+50<8x+3
    x^2≤0
    x^2>0
    x^2≥0
    x^2<0
    -12500+X-(50000+X)x1%≥5000
    -12500+X-(50000+X)x1%≥5000
    x^2+2*x+3>0
    x^2+2*x+3>0
    x*2+2*x+3>0
    (x+5)/(x^2+2*x+3)>=1

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