(0.1+x)*x=0.01*(0.1-x)
    x（x+1）=144
    2x－0.4x＝6－8
    2x－0.4x＝－2
    x²+700x=720
    113*x*sqrt(1-x^2)=4
    (113*x*sqrt(1-x^2))=4
    x = 4/(113*sqrt(1-x^2))
    arctan(3^0.5*x/(2-x))+arctan(3^0.5*x/(4-x))=π/3
    x*x+1/x
    y=1
    2+x+x(2+x)
    3.4×10∧-13＝0.54∧2x÷(0.46-x)∧2
    0.992=0.02568+1.80102x-0.84364（x^2）
    (x+39.99)x＝1110
    (x+39.99)x＝11.1
    1.5X²+9X=26.53
    74.85/123.85＝x/396.162
    78.85/123.85＝x/396.162
    82.85/123.85＝x/396.162

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