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
    4x^3-6x^2+4x-1=0
    （40-x-30）（200x+600）=8400
    x -(26+8+0. 02x)=0. 1x
    X[（1-2X）/2]=0.06
    X（1-2X/2）=0.06
    x^2-16.6x+66.6=x

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