(1200+x)*1.4*25*1.55*3>250000
    (1200+x)*1.4*25*1.55>250000
    (1200+x)*1.4*25>250000
    (1200+x)*1.4*25＞250000
    -12500-(1500+a)*1%+a>5000
    （2x-3）（1-4x）>0
    (3524-0.5x)/1.8*1.4<(2350-0.5x)*1.2*1.2*2.2/1.5*1.4
    (3524-x)/1.8<(2350-x)*1.2*1.2*2.2/1.5
    2sinX(3x-π/4)≥√3
    x²-3x-10≤0
    3a+334<34a+23+lna
    3a+334<34a+23+sina
    3a+334<34a+23+sina
    3a+334<34
    0.7×40x<0.8×40（x-6)
    0.7×40x<0.8×40（x-6)
    1048576x^4+9x^2-1/32>0
    16384x^4+256x^2-2+sqrt(2)<0
    256x^4+(1/576)x^2-0.25>0
    16x^4+(1/36)x^2-1/4>0

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