cos(x)*(0.5*1.28*sin(x)-1*cos(x)*0.5*1.28)>0.5*1.28*1
    cos(x)*(0.5*1.28*sin(x)-0.5*cos(x)*0.5*1.28)>0.5*1.28*0.5
    27x*(50-x)+40x≤1500
    cos(x)*(1/2*0.128*sin(x)-0.5*cos(x)*1/2*0.128)<1/2*0.128*0.5
    cos(x)*(1/2*0.128*sin(x)-0.5*cos(x)*1/2*0.128)＞1/2*0.128*0.5
     ( 0.7602 + 0.1 * x * 0.7602 )< ( 0.5247 + 0.1 * x * 0.5247 ) *2
    (0.7602+0.1*x*0.7602)/(0.5247+0.1*x*0.5247)<2
    0.2015+0.1*x*0.2015<(0.1675+0.1*x*0.1675)*2
    173.3/1000*x+42.7≥56.5/1000*x+16.5
    168.3/1000*x+17≥56.5/1000*x+16.5
    x+3/2x-4<1
    x+3/2x-4>1
    90/1000*x+7≥56.5/1000*x+16.5
    6+3x>0
    3-2x＜0
    1/（x-1）+1/（x-2）+1/（x-3）＞1
    tan(x)＞0
    sin(x)＞0
    x^2-13x+45≤0
    x2-13x+45≤0

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