61640289042269.184+0.647-315089Y(237169Y^2+1129514.88-298823.2Y)＞0
    61640289042269.184+0.647-315089Y(218089Y^2-1129514.88+298823.2Y)＞0
    Y[61640289042269.184+0.647-315089Y(237169Y^2-1129514.88+298823.2Y)]＞0
    61640289042269.184+0.647-315089Y(237169Y^2-1129514.88+298823.2Y)=0
    61640289042269.184+0.647-315089Y(237169Y^2-1129514.88+298823.2Y)＞0
    61640289042269.184+0.647-315089Y(237169Y^2-1162649.28+298823.2Y)＞0
    Y（61640289042269.184+0.647-74729343041Y^3-1162649.28+298823.2Y）＞0
    61640289042269.184+0.647-74729343041Y^3-1162649.28+298823.2Y＞0
    2071696075072170770.417×（1568.1^2×Y-599.6^2Y^3)/(599.6Y-1568.1)^4+4418.9215Y＝0
    2071696075072170770.417×（1568.1^2×Y-599.6^2Y^3)/(599.6Y-1568.1)^4+4418.9215Y＞0
    -6<=-3x^2/2<-4
    x<1/(2-x)
    x(50-2x)(30-2x)>4000
    -41 800+30 000+X－X×10%/4－4 500≥3 000
    arctan30*x-arctan249.9*x = -8.49
    arctan30*x-arctan549.9*x＝-8.49
    5*15+0.35*2*15+0.65*2*(-10)-15 >5*15+p*2*15+(1-p)*2*(-10)-30
    0.3*150+0.4*[7*15+p*3*15+(1-p)*3*(-10)-30]+0.3*[5*15+2*(-10)+p*3*15+(1-p)*3*(-10)-30]<90.75
    （100x-10）/（-100x-10）≤0
    x+87*77>x*99

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