3*(2x-1)-5*x*(x+1)=-1
    x^2-10*x+21=0
    (2x-1)^2-4*(2x-1)+4
    4（x-3）^2=25(x-2)^2
    ㏒(x，x+1)
    9a^4-148a^3+724a^2-1760a+1600=0
    x^2-14.5x+45=0
    x^2-11.2x+31.3=0
    2x^4+9x^3-9x^2+2=0
    2（1+x）^=8.72
    x-(x-800)*0.2=5460
    (x-14249)/x=0.08
    a²+a=600
    （800*x+40）/800=1.5
    c^3+c＝2
    333933+X/1.06*0.06*1.1+0.31X=X
    348933+X/1.06*0.06*1.1+0.31X=X
    0=60t-1.5t^
    160X0.92
    x^2+（10-x）^2=10

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