28.67=（（0.021*x^1.85+429.94）^0.5）*x^0.84
    x^2+3.2x-14.4=0
    3x^3+16x^2+26x+16
    0.0555=((1500-247.73)/200000)*(x^(-0.1))+0.6*(x^(-0.5))
    63÷（1+1+（1/3））=x
    63÷（1+1+（1/3））=x
    3x^2+12x+8
    (6*y/(y-6))*y=6*(6*y/(y-6)+y)
    0.016=x/200000+2*(x/3000)^10
    （0.285+0.005x）*x^1.5=71.083
    246.87=(x^2)/200000+2*x*(x/3000)^10
    0.016=x/200000+2*(x/3000)^10
    7.2=(x^2)/200000+x*(x/1500)^10
    66.327x+5.105x=4000
    x*√（x^2+1）*√（x^2/4+1）=10
    7.2/x=x/200000+(x/1500)^10
    x+xx=99
    3316x+5.105x=4000
    55.53−45.78cos(2x)−18.312sin(2x)−4.22cos(4x)−3.376sin(4x)=0
    0.013=a/(2*10^5)+(a/1500)^10

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