x∧3+6×x∧2-6×x-48＝0
    -647518.724=-589801.43+x-4000-(-589801.43+x-4000)*0.09
    -95549.09=-589801.43+x-4000-(-589801.43+x-4000)*0.09+551969.63
    (1+X)^26 + (1+X)^25 + (1+X)^24 = 5.728
    (1+X)^26 + (1+X)^25 + (1+X)^24 = 5.728
    (1+X)^26 + (1+X)^25 + (1+X)^24 = 5.728
    x²+25x=100
    32+32+(x-3)(x-3)+(6-x)(6-x)=81
    (x+3)(x+3)+(6-x)(6-x)=7
    (x+3)(x+3)+(6-x)(6-x)=7
    11.24x^2+8596x-25195.52x+15498394.24+8656（3.2x-3936.8）+28204388=0
    0.9Q^2+13Q-70=0
    0.25x+0.2(440-x)=100
    142.857*(x+60)+7.143*x=35200
    142.857*(x+60)+7.143*x=40000
    142.857*(x60)+7.143*x=40000
    5x*x*x+2x*x+7=0
    x=sqrt(140x+56)/10x+4
    lgx＝（lg5）+1
    x-(x*0.45-181920)=1130000

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