sqrt132609
    -43n+7^2>4670
    9432+43.5x/(0.88-0.0018x)>30000
    1.8×x＝1.68×x
    ln3
    2^7
    sqrt9
    √9
    ln(3√x+1)
    3*m^2+2*m-9<0
     x(x+2)<0
     2(x+2)<0
     (x+2)<0
    x(x+2)<0
    12t-5t^2＞2
    (10 ^ 6 )/ ( n ^ 2 ) >1
    10^6/(n^2)>1
    （1460.64+X）/（X/1.06+1377.96）<=1.06
    2x-5>-3(x-5)
    X*X+X>=200

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