64=12a
    2.5=x*sqrt(1-2*0.2^2)
    2.5=x*sqrt(1-2*2^2)
    90-arctan(10x)-arctan(0.1x)=30
    （5X+109）/5=x+5
    5X+109/5=x+5
    x^2-36x+37.125=0
    x^2-36x+74.25=0
    x^2-35x+74.25=0
    lgx=0.3
    lg22-lgx=0.3
    -90-arctan(0.5x)-arctan(0.05x)=-180
    -90-arctan0.5x-arctan0.05x=-180
    5=(x+16)/x
    x^2-12x+34.6=0
    x(x+1)-2(x-1)=x²-1
    x=x/1.06*0.06+x/1.06*0.06*0.11+x*0.0003+11100+2095.24
    x = x/1.06*0.06+x/1.06*0.06*0.11+x*0.0003+857.14+5100
    x=x/1.06*0.06+x/1.06*0.06*0.11+x*0.0003+14176.47+52000
    24a^2+62a+14=0

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