-3^2-2x+8
    （15x）²+（20x）²=100²
    (X^2*ln(0.2*11.48/4.074/X))/(1-X)^2/ln(0.8*11.48/47.97/(1-X))=1
    (X^2*ln(0.4*7.798/4.074/X))/(1-X)^2/ln(0.6*7.798/47.97/(1-X))=1
    (X^2*ln(0.4*77.98/4.074/X))/(1-X)^2/ln(0.6*77.98/47.97/(1-X))=1
    (X^2*ln(0.6*1.897/4.074/X))/(1-X)^2/ln(0.4*1.897/47.97/(1-X))=1
    (X^2*ln(0.8*3.342/4.074/X))/(1-X)^2/ln(0.2*3.342/47.97/(1-X))=1
    (X^2*ln(0.8*3.342/4.074/X))/((1-X)^2*ln(0.2*3.342/47.97/(1-X)))=1
    X^2=1
    x²+8²=（6+x）²
    sin x+cos x
    2.5x+3.5x=300
    2.5x*3.5x=300
    x^3-61x^2+510x-9=0
    (3x-12)/(5-x)=0
    lnx=11.46
    2^x-2^-x
    10000000=658*（x*√（x^2+10）*√（x^2+100））
    x^6+110x^4+1000x^2=100000^2
    x^2cos（x+π/4）

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