1000*0.8(50-a)+750*0.6a≥29500
    3*(7m+4)/7+(-m-4)<=0, (7m+4)/7+5*(-m-4)>0
    70*x+120/3*x≥264000
    70*x+120*x≥264000
    -x ^ 2 + 2 * x <1
    -x^2+2x>0
    -x^2+2x>=0
    -x^2+2x<=1
    e^abs(x-1)+cos(x-1)-e^abs(2x)-cos(2x)≥0
    e^(x-1)*abs(x-1)+cos(x-1)-e^(2x)*abs(2x)-cos(2x)≥0
    25n(n＋3)≤100000
    n^3+2n^2+n<=1/300
    (134770000/（X-18） -1 )*（50-(79-2X)） ＜306540000 X＞18 X＜40
    (134770000/（X-18） -1 )*（50-(79-2X)） ＜306540000
    134770000/（X-18）（2X-29）+29-2X＜306540000 X＞18
    134770000/(X-18)(2X-9)+9-2X＜306540000
    x^(-0.405)+100<0.5*x
    1/i-1/i(1+i)^7＜4.167
    X^2-2X-8＞0
    x*x-x<-1/14400

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