225+25×（36x^2-9x+4）^2=16×16(9x^2+1)^2
    x^2-32x+320=0
    k ^2-48k+432=0
    50 = 0.6548x - 23.574
    x^3-2x^2=13
    ln（4-x）
    x-(0.12x)=467.7
    x-(0.12x)=559.5
    2^x＋2^-x
    x+578x÷2080＝80
    (x+60)(10000/70)+x(150-10000/70)=35200
    25×9+25×81(1-x^2+4x)^2=16×(1+9x^2)^2
    X^5-3x^2+1=0
    X^2-4=0
    AX15.9374=100
    (sqrt(5)-x)^2-1+sqrt(5+x^2) = 3
    (sqrt(5)-x)^2-1+sqrt(5+x^2)=3
    （1+2*j）^2
    ((1+x)/(1-x))^(1/x)
    5*t∧2＝0

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