(1+x)^2+1
    （x-2)^2=125
    2(x+0.01)(x+1.67)(x+0.1)+x(x+1.67)(x+0.1)-x(x+0.01)(x+0.1)-x(x+0.01)(x+1.67)=0
    (1/3125)x=3121
    280x=240(x+4)
    （1+x）²＋x²＝5
    2x²＋2x＝√5-1
    144-4t（6-t）＝108
    4t（6-t）＝32
    x^2-10x+4=0
    x^2+5x+6=0
    （40-x）（2x＋20）＝1050
    (3+x)/(4+x)=0.95
    1+x=√3x
    (120-75-x)(400+3x)=13350
    (120-x)(400+3x)=13350
    3x²+40x-34650
    5720x*（195-0.4x）=120*1000000
    11.44x*（195-0.4x）=120*1000000
    11.44x*（195-0.4x）=120

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