0.88*(4a²+4a(0.03/(a-0.01)²+0.02)
    a^4-4a^3+6a^2-4=0
    x-x*0.006=2939.32
    x^3-6*x^2+10=0
    a-1/a=3/2
    75*(1-x)^2=4800/100
    75*(1-x)^2=48
    75*1-x^2=48
    90+arctan(20/x)-arctan(1/3)-arctan(3.67*20/x)-arctan(20/36.7)=35
    x^6+x^2=(2x+3)^3+2x+3
    x^5=2
    x^5=0
    9k^2-600k+6400=0
    -9/2*x*x+13*x=0
    37^x（1-3.612x）=-1
    t^2+t-10/3
    37^x（1-3.612x）=-1
    180-90+arctan(20/x)-arctan(1/3)-arctan(6.3*20/x)-arctan(20/63)=35
    96/600x=60/240x
    x∧3-3x+2＝0

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