(40+x)(20-2x)≥528
    (40-(100-x))(20+2(100-x))≥1200
    (40-x)(20+2x)≥1200
    6-3*x<=4*x-8<3*x-3
    x/(-3)<=5/3*x+2
    3*x+1<2*(x+2)
    10x＞7x＋6
    -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

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