(4-8x)/5≥0 7(1-2x)>10-5(4x-3) x/3+1<-x-(x+10)/2
    1/3x+(2x-5)<4 3(2x-3)≥2(x-4)
    2x-10≥0
    70*2800^n>2801^n
    324t^2-4(2t-9)(90t-t^2)≥0
    x+3/2≥1
    x/8<1
    x-2（x-1）≥1 2+6x＞2x-4
    x-2（x-1）≥1 2+6x＞2x-2
    x*ln(x)=1000000
    x*lg(x)=1000000
    x*lg(x)>1000000
    x*lg(x)<1000000
    x^3<1000000
    a^3-200a+18000>0
    （180-3x）/2+x≤60
    8x+(900-15x)/2≤460
    （180-3x）/2+x≤1
    5M*M-38M+53≤0
    x^12+3x^10+5x^8+3x^6-2x^4<1

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