50=(100+x)*x/[(200+x)*(100-x)]
    x^2=13.8
    x^2=13.8
    x^2
    x^2
    x^2-2x+2
    x^2=13.8
    x^2=13.8
    1000000-5000x-51x²=0
    x²/[(200+x)*(100-x)]=50
    x²/[(200+x)*(100-x)]=50
    x²/[(200+x)*(100-x)]=500
    41*（1+x)^14=1867
    501x²+50000x-10000000=0
    450x-310.02-240x-(450x*0.13-15*-30.4)*0.12=0
    ((X+20)/(1-0.004))*0.004=2000
    （1+1.5x）*（1.63x+0.957）=2.63*2.5x
    （1+1.5x）*（1.63x+0.957）=2.6*2.5x
    3x2十8x
    -1/2x^2+1/3x+8/3=0

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