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
    √3-x^2＞0
    x^2+4x+4>=0
    0.8184*0.2^x<0.05
    2x-6>1+3-4+5+6+7 x^2<123
    7/3x-11/6(x+3)>(0.03x-0.01)/0.05-(1.3-0.1x)/0.2
    10000*7.18<=10000*(1+4%)*(7.18-x)
    -450+X-690-X*8%/4≥500

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