10×9442.2^2 = 2×（599.6X-1568.1）^3
    10×9442.2^3= 2×（599.6X-1568.1）^3
    -0.95=lgx
    0.6=lgx
    18（10-x）÷（10+x）≤10
    2×1568.1×1005021830801.29=4031.175×（599.6X-1568.1）^3
    （100-X）20(70-X)=720
    7200/b+2b>240
    b^2+3600b-120>0
    4-5x＞-21
    61640289042269.184-5.65*315089Y（237169Y^2-1129514.88）+5.65*896469.6Y = 0
    61640289042269.184-315089Y（237169Y^2-1129514.88）+5.65*896469.6Y = 0
    61640289042269.184Y-315089Y（237169Y^2-1129514.88）+5.65*896469.6Y = 0
    91902.5536*61640289042269.184Y-315089Y（237169Y^2-1129514.88）+5.65*896469.6Y=0
    61640289042269.184+315089Y（237169Y^2-1129514.88）+5.65*896469.6Y=0
    61640289042269.184-315089Y（237169Y^2+1129514.88）-5.65*896469.6Y=0
    61640289042269.184-315089Y（237169Y^2-1129514.88）+5.65*896469.6Y=0
    61789761210185.216-315089Y（237169Y^2-1129514.88）+5.65*896469.6Y=0
    61789761210185.216-315089Y（237169Y^2-1129514.88+896469.6Y）=0
    61640289042269.184+0.647+315089Y（237169Y^2-1129514.88+896469.6Y）=0

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