x(3*sqrt(17-x^2)+sqrt(25-9*x^2))=5*sqrt(17)
    6E-0.9X^3
    1/2x-2
    0.01x+x^2=0.000014-0.0014x
    x（0.01+x）=0.000014-0.0014x
    sprtx x
    x∧3➕x＝130
    101x/100*12=250346.76
    （95.68-X)*(65.45-X)=4050
     x-0.18x = 50000
    x²＋34x=72
    72x²-85x+24.5=0
    1.6x^2-10.4x+7.8=0
    xxxxx=9
    x*0.59*1.81*1.3=1.45
    x^2+0.335x-0.01675＝0
    6*(x-1800)=5*(x-1200)
    5x^2+18x-135=0
    (x+5)^2+(3/4*x）^2=100
    -x^2+x-1/3*ln(x+1/3)-2/3*ln(1/3)

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