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
    20000x^4+200x^2-2+sqrt(2)<0
    256x^4+(1/576)x^2-1>0
    50x+20×3x≤2500
    256x^4+16x^2-2+sqrt(2)<0
    512x^4+32x^2-2+sqrt(2)<0
    50x+20×3x≥2200
    x^4+(1/9216)x^2-1>0
    30a+（30-a）×40≥1000
    x*6-5x^2/4x<3/4
    x²+4x-3≤2
    5x+4>4x=5 2x>x+3
    x+1<0
    -2x≤6

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