-440.31-158.11*n+（305.92*n+26.74*n^2）*(458.88*n+26.74*n^2)/(1835.52+160.44*n)-1.2*(69.03+4.87*n)*(208.59*n+9.74*n^2)/(29.22*n+417.18)≥0
    (5x-2)/(x+5)>6
    1/(x-3)>-1
    (1/2x+3)60+80x<1170
    e^x-1/2x-1＞0
    4+x<=2^x-1
    5500×60+5000(x-6)>550000
    8+x<=(2^x)-1
    10x-25×5+5x>100
    10x-25×5>100
    t+2^19÷2^t-20＜0
    (49.14xx+937.5x)/(147.42x+1875)*(24.57xx+312.5x)-1.2*(6.25xx+610.32x)/(37.5x+1220.64)*(12.5xx+610.32x)+117.95x-929.47>0
    (49.14*5^2+937.5*5)/(147.42*5+1875)*(24.57*5^2+312.5*5)-1.2*(6.25*5^2+610.32*5)/(37.5*5+1220.64)*(12.5*5^2+610.32*5)+117.95*5-929.47>0
    (49.14*5^2+937.5x)/(147.42*5+1875)*(24.57*5^2+312.5*5)-1.2*(6.25*5^2+610.32*5)/(37.5*5+1220.64)*(12.5*5^2+610.32*5)+117.95*5-929.47>0
    (49.14x^2+937.5x)/(147.42x+1875)*(24.57x^2+312.5x)-1.2*(6.25x^2+610.32x)/(37.5x+1220.64)*(12.5x^2+610.32x)-117.95x-929.47>0
    (49.14x^2+937.5x)/(147.42x+1875)*(24.57x^2+312.5x)-1.2*(6.25x^2+610.32x)/(37.5x+1220.64)*(12.5x^2+610.32x)+117.95x-929.47>0
    -0.01x^2+2x-1≥55
    （x-2）÷5-（x+4）÷2＞-3
    4/5(380－x)+x≤400×85%
    108.33*x+9.665*x^2>316+63.2*x

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