31.4r^(2)+2.09r^(3)=2943.75
    x+1＝2
    20-8*x-1024*x*x*x
    2.5=6*39.646*√0.948*x
    8x-12>48-3x 6x-3x+3≥12-2x-4
    24=(1657.46/（7.07-lgx）)-227-(2396/(1.01+1.88*(0.622*0.2x/(101.3-0.2x)))*(0.019-(0.622*0.2x/(101.3-0.2x))))
    46.40145(e^(-0.1474x)-e^(-2.6853x))=0
    275-145x-10x*x=0
    2x-6<3x 4x+8≤5x-5
    46.40145(e-0.1474x-e-2.6853x)=0
    2/5+x=7/10
    24=(1687.537/（5.11564-lgx）)-230.17-(2396/(1.01+1.88*(0.622*0.2x/(101.3-0.2x)))*(0.019-(0.622*0.2x/(101.3-0.2x))))
    r^2-3r=0
    x^3+2x^2−x=0
    1/(1/317.55-8.315*ln0.967425/242100)
    1.5*2.718^(-1.5)
    1/317.53-(8.315/242100)*lnx=1/329.05-(8.315/255600)*ln(1-x)
    ((1-1/(1+0.17/(x-500000))^0.4)*(x-500000) - 1296
    ((1-1/(1+0.17/x)^0.4)*x - 1296
    24=(1687.537/（5.11564-lgx）)-230.17-(2396*(0.019-(0.622*0.2x/(101.3-0.2x)))/(1.01+1.88*(0.622*0.2x/(101.3-0.2x))))

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