-x>-6
    3x-1=
    x+4≥3
    3x-5＞5x+3
    7x-2(10-x)≥7(2x-5)
    -1239.68+575.98+（376.96*n+18.82*n^2）*(1130.88*n+37.63*n^2)/(2261.76+112.89*n)-1.2*(125.82*n+4.87*n^2)*(377.46*n+9.74*n^2)/(29.22*n+754.92)≥0
    (45000+12000)/153.86 + 64*f*32/3.14/14^3 <= 548.9
    (1330+30*b^2)/b^2 <= 300
    (1330+30*b^2)/b^2 + 980*6/b^3 <= 360
    30*b^3+1330*b-5880>=0
    980/(1330+30*b^2)<=b/6
    30*b^2+1330*b-5880>=0
    （1001-x）（1-x）÷x＞1
    （2x-1）/x＞1
    3n×n-199n+2450＜0
    4*25*(m^2-25*18)/64-(5*m/4+25)^2 >0
    0.5*cosx＜sinx
    0.5*cosx*9.8*0.0061＜9.8*0.0061sinx
    sinx＜1/2
    3x^2+4x*1＞0

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