4x^4+9x^2=1
    x^2-32.21x=0
    4x^2+3900x+960000=0
    100=(x^2)*(0.04x^2+1)*(0.00025x^2+1)*(x^2/3600+1)/(1+X^2)
    1.2+(x-1,2)/5=2x/3
    (3x-2):(2x+3)=4:7
    (x+3)/4=1+(3x-10)/5
    (15.608221-27)^2+(y+9.5)^2 = 14.5^2
    √(130.61^2+3×34.11^2 )
    (20.04572-27)^2+(y+9.5)^2 = 14.5^2
    (x-27)^2+(44x/9-853/9+9.5)^2=14.5^2
    (1.0×21.04×10^3)/(11.5×164)
    50=0.000000001x3-0.00001x2+0.045x+3.9869
    350000*（1+x）^24+5833*((1+x)^24-1)/x=600000
    0.98^32
    50 = 1E-09x3 - 1E-05x2 + 0.045x + 3.9869
    (250+x/2)^0.5=5+0.5(400+x)^0.5
    （72000+8x）/14=30000
    50 = 1E-09x3 - 1E-05x2 + 0.045x + 3.986
    （72000+8x）14=30000

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